Merge pull request #581 from kevmoo/polymer

lib/shadowdom.debug.js

-if ((!HTMLElement.prototype.createShadowRoot &&
-    !HTMLElement.prototype.webkitCreateShadowRoot) ||
-    window.__forceShadowDomPolyfill) {
-
-/*
- * Copyright 2013 The Polymer Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-(function() {
-  // TODO(jmesserly): fix dart:html to use unprefixed name
-  if (Element.prototype.webkitCreateShadowRoot) {
-    Element.prototype.webkitCreateShadowRoot = function() {
-      return window.ShadowDOMPolyfill.wrapIfNeeded(this).createShadowRoot();
-    };
-  }
-})();
-
-/*
- * Copyright 2012 The Polymer Authors. All rights reserved.
- * Use of this source code is goverened by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-// SideTable is a weak map where possible. If WeakMap is not available the
-// association is stored as an expando property.
-var SideTable;
-// TODO(arv): WeakMap does not allow for Node etc to be keys in Firefox
-if (typeof WeakMap !== 'undefined' && navigator.userAgent.indexOf('Firefox/') < 0) {
-  SideTable = WeakMap;
-} else {
-  (function() {
-    var defineProperty = Object.defineProperty;
-    var hasOwnProperty = Object.hasOwnProperty;
-    var counter = new Date().getTime() % 1e9;
-
-    SideTable = function() {
-      this.name = '__st' + (Math.random() * 1e9 >>> 0) + (counter++ + '__');
-    };
-
-    SideTable.prototype = {
-      set: function(key, value) {
-        defineProperty(key, this.name, {value: value, writable: true});
-      },
-      get: function(key) {
-        return hasOwnProperty.call(key, this.name) ? key[this.name] : undefined;
-      },
-      delete: function(key) {
-        this.set(key, undefined);
-      }
-    }
-  })();
-}
-
-// Copyright 2012 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-var ShadowDOMPolyfill = {};
-
-(function(scope) {
-  'use strict';
-
-  var wrapperTable = new SideTable();
-  var constructorTable = new SideTable();
-  var wrappers = Object.create(null);
-
-  function assert(b) {
-    if (!b)
-      throw new Error('Assertion failed');
-  };
-
-  function mixin(to, from) {
-    Object.getOwnPropertyNames(from).forEach(function(name) {
-      Object.defineProperty(to, name,
-                            Object.getOwnPropertyDescriptor(from, name));
-    });
-    return to;
-  };
-
-  function mixinStatics(to, from) {
-    Object.getOwnPropertyNames(from).forEach(function(name) {
-      switch (name) {
-        case 'arguments':
-        case 'caller':
-        case 'length':
-        case 'name':
-        case 'prototype':
-        case 'toString':
-          return;
-      }
-      Object.defineProperty(to, name,
-                            Object.getOwnPropertyDescriptor(from, name));
-    });
-    return to;
-  };
-
-  // Mozilla's old DOM bindings are bretty busted:
-  // https://bugzilla.mozilla.org/show_bug.cgi?id=855844
-  // Make sure they are create before we start modifying things.
-  Object.getOwnPropertyNames(window);
-
-  function getWrapperConstructor(node) {
-    var nativePrototype = node.__proto__ || Object.getPrototypeOf(node);
-    var wrapperConstructor = constructorTable.get(nativePrototype);
-    if (wrapperConstructor)
-      return wrapperConstructor;
-
-    var parentWrapperConstructor = getWrapperConstructor(nativePrototype);
-
-    var GeneratedWrapper = createWrapperConstructor(parentWrapperConstructor);
-    registerInternal(nativePrototype, GeneratedWrapper, node);
-
-    return GeneratedWrapper;
-  }
-
-  function addForwardingProperties(nativePrototype, wrapperPrototype) {
-    installProperty(nativePrototype, wrapperPrototype, true);
-  }
-
-  function registerInstanceProperties(wrapperPrototype, instanceObject) {
-    installProperty(instanceObject, wrapperPrototype, false);
-  }
-
-  var isFirefox = /Firefox/.test(navigator.userAgent);
-
-  // This is used as a fallback when getting the descriptor fails in
-  // installProperty.
-  var dummyDescriptor = {
-    get: function() {},
-    set: function(v) {},
-    configurable: true,
-    enumerable: true
-  };
-
-  function installProperty(source, target, allowMethod) {
-    Object.getOwnPropertyNames(source).forEach(function(name) {
-      if (name in target)
-        return;
-
-      if (isFirefox) {
-        // Tickle Firefox's old bindings.
-        source.__lookupGetter__(name);
-      }
-      var descriptor;
-      try {
-        descriptor = Object.getOwnPropertyDescriptor(source, name);
-      } catch (ex) {
-        // JSC and V8 both use data properties instead accessors which can cause
-        // getting the property desciptor throw an exception.
-        // https://bugs.webkit.org/show_bug.cgi?id=49739
-        descriptor = dummyDescriptor;
-      }
-      var getter, setter;
-      if (allowMethod && typeof descriptor.value === 'function') {
-        target[name] = function() {
-          return this.impl[name].apply(this.impl, arguments);
-        };
-        return;
-      }
-
-      getter = function() {
-        return this.impl[name];
-      };
-
-      if (descriptor.writable || descriptor.set) {
-        setter = function(value) {
-          this.impl[name] = value;
-        };
-      }
-
-      Object.defineProperty(target, name, {
-        get: getter,
-        set: setter,
-        configurable: descriptor.configurable,
-        enumerable: descriptor.enumerable
-      });
-    });
-  }
-
-  /**
-   * @param {Function} nativeConstructor
-   * @param {Function} wrapperConstructor
-   * @param {string|Object=} opt_instance If present, this is used to extract
-   *     properties from an instance object. If this is a string
-   *     |document.createElement| is used to create an instance.
-   */
-  function register(nativeConstructor, wrapperConstructor, opt_instance) {
-    var nativePrototype = nativeConstructor.prototype;
-    registerInternal(nativePrototype, wrapperConstructor, opt_instance);
-    mixinStatics(wrapperConstructor, nativeConstructor);
-  }
-
-  function registerInternal(nativePrototype, wrapperConstructor, opt_instance) {
-    var wrapperPrototype = wrapperConstructor.prototype;
-    assert(constructorTable.get(nativePrototype) === undefined);
-    constructorTable.set(nativePrototype, wrapperConstructor);
-    addForwardingProperties(nativePrototype, wrapperPrototype);
-    if (opt_instance)
-      registerInstanceProperties(wrapperPrototype, opt_instance);
-  }
-
-  function isWrapperFor(wrapperConstructor, nativeConstructor) {
-    return constructorTable.get(nativeConstructor.prototype) ===
-        wrapperConstructor;
-  }
-
-  /**
-   * Creates a generic wrapper constructor based on |object| and its
-   * constructor.
-   * Sometimes the constructor does not have an associated instance
-   * (CharacterData for example). In that case you can pass the constructor that
-   * you want to map the object to using |opt_nativeConstructor|.
-   * @param {Node} object
-   * @param {Function=} opt_nativeConstructor
-   * @return {Function} The generated constructor.
-   */
-  function registerObject(object) {
-    var nativePrototype = Object.getPrototypeOf(object);
-
-    var superWrapperConstructor = getWrapperConstructor(nativePrototype);
-    var GeneratedWrapper = createWrapperConstructor(superWrapperConstructor);
-    registerInternal(nativePrototype, GeneratedWrapper, object);
-
-    return GeneratedWrapper;
-  }
-
-  function createWrapperConstructor(superWrapperConstructor) {
-    function GeneratedWrapper(node) {
-      superWrapperConstructor.call(this, node);
-    }
-    GeneratedWrapper.prototype =
-        Object.create(superWrapperConstructor.prototype);
-    GeneratedWrapper.prototype.constructor = GeneratedWrapper;
-
-    return GeneratedWrapper;
-  }
-
-  var OriginalDOMImplementation = DOMImplementation;
-  var OriginalEvent = Event;
-  var OriginalNode = Node;
-  var OriginalWindow = Window;
-
-  function isWrapper(object) {
-    return object instanceof wrappers.EventTarget ||
-           object instanceof wrappers.Event ||
-           object instanceof wrappers.DOMImplementation;
-  }
-
-  function isNative(object) {
-    return object instanceof OriginalNode ||
-           object instanceof OriginalEvent ||
-           object instanceof OriginalWindow ||
-           object instanceof OriginalDOMImplementation;
-  }
-
-  /**
-   * Wraps a node in a WrapperNode. If there already exists a wrapper for the
-   * |node| that wrapper is returned instead.
-   * @param {Node} node
-   * @return {WrapperNode}
-   */
-  function wrap(impl) {
-    if (impl === null)
-      return null;
-
-    assert(isNative(impl));
-    var wrapper = wrapperTable.get(impl);
-    if (!wrapper) {
-      var wrapperConstructor = getWrapperConstructor(impl);
-      wrapper = new wrapperConstructor(impl);
-      wrapperTable.set(impl, wrapper);
-    }
-    return wrapper;
-  }
-
-  /**
-   * Unwraps a wrapper and returns the node it is wrapping.
-   * @param {WrapperNode} wrapper
-   * @return {Node}
-   */
-  function unwrap(wrapper) {
-    if (wrapper === null)
-      return null;
-    assert(isWrapper(wrapper));
-    return wrapper.impl;
-  }
-
-  /**
-   * Unwraps object if it is a wrapper.
-   * @param {Object} object
-   * @return {Object} The native implementation object.
-   */
-  function unwrapIfNeeded(object) {
-    return object && isWrapper(object) ? unwrap(object) : object;
-  }
-
-  /**
-   * Wraps object if it is not a wrapper.
-   * @param {Object} object
-   * @return {Object} The wrapper for object.
-   */
-  function wrapIfNeeded(object) {
-    return object && !isWrapper(object) ? wrap(object) : object;
-  }
-
-  /**
-   * Overrides the current wrapper (if any) for node.
-   * @param {Node} node
-   * @param {WrapperNode=} wrapper If left out the wrapper will be created as
-   *     needed next time someone wraps the node.
-   */
-  function rewrap(node, wrapper) {
-    if (wrapper === null)
-      return;
-    assert(isNative(node));
-    assert(wrapper === undefined || isWrapper(wrapper));
-    wrapperTable.set(node, wrapper);
-  }
-
-  function defineGetter(constructor, name, getter) {
-    Object.defineProperty(constructor.prototype, name, {
-      get: getter,
-      configurable: true,
-      enumerable: true
-    });
-  }
-
-  function defineWrapGetter(constructor, name) {
-    defineGetter(constructor, name, function() {
-      return wrap(this.impl[name]);
-    });
-  }
-
-  /**
-   * Forwards existing methods on the native object to the wrapper methods.
-   * This does not wrap any of the arguments or the return value since the
-   * wrapper implementation already takes care of that.
-   * @param {Array.<Function>} constructors
-   * @parem {Array.<string>} names
-   */
-  function forwardMethodsToWrapper(constructors, names) {
-    constructors.forEach(function(constructor) {
-      names.forEach(function(name) {
-        constructor.prototype[name] = function() {
-          var w = wrap(this);
-          return w[name].apply(w, arguments);
-        };
-      });
-    });
-  }
-
-  scope.assert = assert;
-  scope.defineGetter = defineGetter;
-  scope.defineWrapGetter = defineWrapGetter;
-  scope.forwardMethodsToWrapper = forwardMethodsToWrapper;
-  scope.isWrapper = isWrapper;
-  scope.isWrapperFor = isWrapperFor;
-  scope.mixin = mixin;
-  scope.registerObject = registerObject;
-  scope.registerWrapper = register;
-  scope.rewrap = rewrap;
-  scope.unwrap = unwrap;
-  scope.unwrapIfNeeded = unwrapIfNeeded;
-  scope.wrap = wrap;
-  scope.wrapIfNeeded = wrapIfNeeded;
-  scope.wrappers = wrappers;
-
-})(this.ShadowDOMPolyfill);
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var forwardMethodsToWrapper = scope.forwardMethodsToWrapper;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var unwrap = scope.unwrap;
-  var wrap = scope.wrap;
-  var wrappers = scope.wrappers;
-
-  var wrappedFuns = new SideTable();
-  var listenersTable = new SideTable();
-  var handledEventsTable = new SideTable();
-  var targetTable = new SideTable();
-  var currentTargetTable = new SideTable();
-  var relatedTargetTable = new SideTable();
-  var eventPhaseTable = new SideTable();
-  var stopPropagationTable = new SideTable();
-  var stopImmediatePropagationTable = new SideTable();
-
-  function isShadowRoot(node) {
-    return node instanceof wrappers.ShadowRoot;
-  }
-
-  function isInsertionPoint(node) {
-    var localName = node.localName;
-    return localName === 'content' || localName === 'shadow';
-  }
-
-  function isShadowHost(node) {
-    return !!node.shadowRoot;
-  }
-
-  function getEventParent(node) {
-    var dv;
-    return node.parentNode || (dv = node.defaultView) && wrap(dv) || null;
-  }
-
-  // https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#dfn-adjusted-parent
-  function calculateParents(node, context, ancestors) {
-    if (ancestors.length)
-      return ancestors.shift();
-
-    // 1.
-    if (isShadowRoot(node))
-      return node.insertionParent || scope.getHostForShadowRoot(node);
-
-    // 2.
-    var eventParents = scope.eventParentsTable.get(node);
-    if (eventParents) {
-      // Copy over the remaining event parents for next iteration.
-      for (var i = 1; i < eventParents.length; i++) {
-        ancestors[i - 1] = eventParents[i];
-      }
-      return eventParents[0];
-    }
-
-    // 3.
-    if (context && isInsertionPoint(node)) {
-      var parentNode = node.parentNode;
-      if (parentNode && isShadowHost(parentNode)) {
-        var trees = scope.getShadowTrees(parentNode);
-        var p = context.insertionParent;
-        for (var i = 0; i < trees.length; i++) {
-          if (trees[i].contains(p))
-            return p;
-        }
-      }
-    }
-
-    return getEventParent(node);
-  }
-
-  // https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#event-retargeting
-  function retarget(node) {
-    var stack = [];  // 1.
-    var ancestor = node;  // 2.
-    var targets = [];
-    var ancestors = [];
-    while (ancestor) {  // 3.
-      var context = null;  // 3.2.
-      // TODO(arv): Change order of these. If the stack is empty we always end
-      // up pushing ancestor, no matter what.
-      if (isInsertionPoint(ancestor)) {  // 3.1.
-        context = topMostNotInsertionPoint(stack);  // 3.1.1.
-        var top = stack[stack.length - 1] || ancestor;  // 3.1.2.
-        stack.push(top);
-      } else if (!stack.length) {
-        stack.push(ancestor);  // 3.3.
-      }
-      var target = stack[stack.length - 1];  // 3.4.
-      targets.push({target: target, currentTarget: ancestor});  // 3.5.
-      if (isShadowRoot(ancestor))  // 3.6.
-        stack.pop();  // 3.6.1.
-
-      ancestor = calculateParents(ancestor, context, ancestors);  // 3.7.
-    }
-    return targets;
-  }
-
-  function topMostNotInsertionPoint(stack) {
-    for (var i = stack.length - 1; i >= 0; i--) {
-      if (!isInsertionPoint(stack[i]))
-        return stack[i];
-    }
-    return null;
-  }
-
-  // https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#dfn-adjusted-related-target
-  function adjustRelatedTarget(target, related) {
-    var ancestors = [];
-    while (target) {  // 3.
-      var stack = [];  // 3.1.
-      var ancestor = related;  // 3.2.
-      var last = undefined;  // 3.3. Needs to be reset every iteration.
-      while (ancestor) {
-        var context = null;
-        if (!stack.length) {
-          stack.push(ancestor);
-        } else {
-          if (isInsertionPoint(ancestor)) {  // 3.4.3.
-            context = topMostNotInsertionPoint(stack);
-            // isDistributed is more general than checking whether last is
-            // assigned into ancestor.
-            if (isDistributed(last)) {  // 3.4.3.2.
-              var head = stack[stack.length - 1];
-              stack.push(head);
-            }
-          }
-        }
-
-        if (inSameTree(ancestor, target))  // 3.4.4.
-          return stack[stack.length - 1];
-
-        if (isShadowRoot(ancestor))  // 3.4.5.
-          stack.pop();
-
-        last = ancestor;  // 3.4.6.
-        ancestor = calculateParents(ancestor, context, ancestors);  // 3.4.7.
-      }
-      if (isShadowRoot(target))  // 3.5.
-        target = scope.getHostForShadowRoot(target);
-      else
-        target = target.parentNode;  // 3.6.
-    }
-  }
-
-  function isDistributed(node) {
-    return node.insertionParent;
-  }
-
-  function rootOfNode(node) {
-    var p;
-    while (p = node.parentNode) {
-      node = p;
-    }
-    return node;
-  }
-
-  function inSameTree(a, b) {
-    return rootOfNode(a) === rootOfNode(b);
-  }
-
-  function isMutationEvent(type) {
-    switch (type) {
-      case 'DOMAttrModified':
-      case 'DOMAttributeNameChanged':
-      case 'DOMCharacterDataModified':
-      case 'DOMElementNameChanged':
-      case 'DOMNodeInserted':
-      case 'DOMNodeInsertedIntoDocument':
-      case 'DOMNodeRemoved':
-      case 'DOMNodeRemovedFromDocument':
-      case 'DOMSubtreeModified':
-        return true;
-    }
-    return false;
-  }
-
-  function dispatchOriginalEvent(originalEvent) {
-    // Make sure this event is only dispatched once.
-    if (handledEventsTable.get(originalEvent))
-      return;
-    handledEventsTable.set(originalEvent, true);
-
-    // Don't do rendering if this is a mutation event since rendering might
-    // mutate the DOM which would fire more events and we would most likely
-    // just iloop.
-    if (!isMutationEvent(originalEvent.type))
-      scope.renderAllPending();
-
-    var target = wrap(originalEvent.target);
-    var event = wrap(originalEvent);
-    return dispatchEvent(event, target);
-  }
-
-  function dispatchEvent(event, originalWrapperTarget) {
-    var eventPath = retarget(originalWrapperTarget);
-
-    // For window load events the load event is dispatched at the window but
-    // the target is set to the document.
-    //
-    // http://www.whatwg.org/specs/web-apps/current-work/multipage/the-end.html#the-end
-    //
-    // TODO(arv): Find a loess hacky way to do this.
-    if (event.type === 'load' &&
-        eventPath.length === 2 &&
-        eventPath[0].target instanceof wrappers.Document) {
-      eventPath.shift();
-    }
-
-    if (dispatchCapturing(event, eventPath)) {
-      if (dispatchAtTarget(event, eventPath)) {
-        dispatchBubbling(event, eventPath);
-      }
-    }
-
-    eventPhaseTable.set(event, Event.NONE);
-    currentTargetTable.set(event, null);
-
-    return event.defaultPrevented;
-  }
-
-  function dispatchCapturing(event, eventPath) {
-    var phase;
-
-    for (var i = eventPath.length - 1; i > 0; i--) {
-      var target = eventPath[i].target;
-      var currentTarget = eventPath[i].currentTarget;
-      if (target === currentTarget)
-        continue;
-
-      phase = Event.CAPTURING_PHASE;
-      if (!invoke(eventPath[i], event, phase))
-        return false;
-    }
-
-    return true;
-  }
-
-  function dispatchAtTarget(event, eventPath) {
-    var phase = Event.AT_TARGET;
-    return invoke(eventPath[0], event, phase);
-  }
-
-  function dispatchBubbling(event, eventPath) {
-    var bubbles = event.bubbles;
-    var phase;
-
-    for (var i = 1; i < eventPath.length; i++) {
-      var target = eventPath[i].target;
-      var currentTarget = eventPath[i].currentTarget;
-      if (target === currentTarget)
-        phase = Event.AT_TARGET;
-      else if (bubbles && !stopImmediatePropagationTable.get(event))
-        phase = Event.BUBBLING_PHASE;
-      else
-        continue;
-
-      if (!invoke(eventPath[i], event, phase))
-        return;
-    }
-  }
-
-  function invoke(tuple, event, phase) {
-    var target = tuple.target;
-    var currentTarget = tuple.currentTarget;
-
-    var listeners = listenersTable.get(currentTarget);
-    if (!listeners)
-      return true;
-
-    if ('relatedTarget' in event) {
-      var originalEvent = unwrap(event);
-      var relatedTarget = wrap(originalEvent.relatedTarget);
-
-      var adjusted = adjustRelatedTarget(currentTarget, relatedTarget);
-      if (adjusted === target)
-        return true;
-
-      relatedTargetTable.set(event, adjusted);
-    }
-
-    eventPhaseTable.set(event, phase);
-    var type = event.type;
-
-    var anyRemoved = false;
-    targetTable.set(event, target);
-    currentTargetTable.set(event, currentTarget);
-
-    for (var i = 0; i < listeners.length; i++) {
-      var listener = listeners[i];
-      if (listener.removed) {
-        anyRemoved = true;
-        continue;
-      }
-
-      if (listener.type !== type ||
-          !listener.capture && phase === Event.CAPTURING_PHASE ||
-          listener.capture && phase === Event.BUBBLING_PHASE) {
-        continue;
-      }
-
-      try {
-        if (typeof listener.handler === 'function')
-          listener.handler.call(currentTarget, event);
-        else
-          listener.handler.handleEvent(event);
-
-        if (stopImmediatePropagationTable.get(event))
-          return false;
-
-      } catch (ex) {
-        if (window.onerror)
-          window.onerror(ex.message);
-        else
-          console.error(ex);
-      }
-    }
-
-    if (anyRemoved) {
-      var copy = listeners.slice();
-      listeners.length = 0;
-      for (var i = 0; i < copy.length; i++) {
-        if (!copy[i].removed)
-          listeners.push(copy[i]);
-      }
-    }
-
-    return !stopPropagationTable.get(event);
-  }
-
-  function Listener(type, handler, capture) {
-    this.type = type;
-    this.handler = handler;
-    this.capture = Boolean(capture);
-  }
-  Listener.prototype = {
-    equals: function(that) {
-      return this.handler === that.handler && this.type === that.type &&
-          this.capture === that.capture;
-    },
-    get removed() {
-      return this.handler === null;
-    },
-    remove: function() {
-      this.handler = null;
-    }
-  };
-
-  var OriginalEvent = window.Event;
-
-  /**
-   * Creates a new Event wrapper or wraps an existin native Event object.
-   * @param {string|Event} type
-   * @param {Object=} options
-   * @constructor
-   */
-  function Event(type, options) {
-    if (type instanceof OriginalEvent)
-      this.impl = type;
-    else
-      return wrap(constructEvent(OriginalEvent, 'Event', type, options));
-  }
-  Event.prototype = {
-    get target() {
-      return targetTable.get(this);
-    },
-    get currentTarget() {
-      return currentTargetTable.get(this);
-    },
-    get eventPhase() {
-      return eventPhaseTable.get(this);
-    },
-    stopPropagation: function() {
-      stopPropagationTable.set(this, true);
-    },
-    stopImmediatePropagation: function() {
-      stopPropagationTable.set(this, true);
-      stopImmediatePropagationTable.set(this, true);
-    }
-  };
-  registerWrapper(OriginalEvent, Event, document.createEvent('Event'));
-
-  function unwrapOptions(options) {
-    if (!options || !options.relatedTarget)
-      return options;
-    return Object.create(options, {
-      relatedTarget: {value: unwrap(options.relatedTarget)}
-    });
-  }
-
-  function registerGenericEvent(name, SuperEvent, prototype) {
-    var OriginalEvent = window[name];
-    var GenericEvent = function(type, options) {
-      if (type instanceof OriginalEvent)
-        this.impl = type;
-      else
-        return wrap(constructEvent(OriginalEvent, name, type, options));
-    };
-    GenericEvent.prototype = Object.create(SuperEvent.prototype);
-    if (prototype)
-      mixin(GenericEvent.prototype, prototype);
-    // Firefox does not support FocusEvent
-    // https://bugzilla.mozilla.org/show_bug.cgi?id=855741
-    if (OriginalEvent)
-      registerWrapper(OriginalEvent, GenericEvent, document.createEvent(name));
-    return GenericEvent;
-  }
-
-  var UIEvent = registerGenericEvent('UIEvent', Event);
-  var CustomEvent = registerGenericEvent('CustomEvent', Event);
-
-  var relatedTargetProto = {
-    get relatedTarget() {
-      return relatedTargetTable.get(this) || wrap(unwrap(this).relatedTarget);
-    }
-  };
-
-  function getInitFunction(name, relatedTargetIndex) {
-    return function() {
-      arguments[relatedTargetIndex] = unwrap(arguments[relatedTargetIndex]);
-      var impl = unwrap(this);
-      impl[name].apply(impl, arguments);
-    };
-  }
-
-  var mouseEventProto = mixin({
-    initMouseEvent: getInitFunction('initMouseEvent', 14)
-  }, relatedTargetProto);
-
-  var focusEventProto = mixin({
-    initFocusEvent: getInitFunction('initFocusEvent', 5)
-  }, relatedTargetProto);
-
-  var MouseEvent = registerGenericEvent('MouseEvent', UIEvent, mouseEventProto);
-  var FocusEvent = registerGenericEvent('FocusEvent', UIEvent, focusEventProto);
-
-  var MutationEvent = registerGenericEvent('MutationEvent', Event, {
-    initMutationEvent: getInitFunction('initMutationEvent', 3),
-    get relatedNode() {
-      return wrap(this.impl.relatedNode);
-    },
-  });
-
-  // In case the browser does not support event constructors we polyfill that
-  // by calling `createEvent('Foo')` and `initFooEvent` where the arguments to
-  // `initFooEvent` are derived from the registered default event init dict.
-  var defaultInitDicts = Object.create(null);
-
-  var supportsEventConstructors = (function() {
-    try {
-      new window.MouseEvent('click');
-    } catch (ex) {
-      return false;
-    }
-    return true;
-  })();
-
-  /**
-   * Constructs a new native event.
-   */
-  function constructEvent(OriginalEvent, name, type, options) {
-    if (supportsEventConstructors)
-      return new OriginalEvent(type, unwrapOptions(options));
-
-    // Create the arguments from the default dictionary.
-    var event = unwrap(document.createEvent(name));
-    var defaultDict = defaultInitDicts[name];
-    var args = [type];
-    Object.keys(defaultDict).forEach(function(key) {
-      var v = options != null && key in options ?
-          options[key] : defaultDict[key];
-      if (key === 'relatedTarget')
-        v = unwrap(v);
-      args.push(v);
-    });
-    event['init' + name].apply(event, args);
-    return event;
-  }
-
-  if (!supportsEventConstructors) {
-    var configureEventConstructor = function(name, initDict, superName) {
-      if (superName) {
-        var superDict = defaultInitDicts[superName];
-        initDict = mixin(mixin({}, superDict), initDict);
-      }
-
-      defaultInitDicts[name] = initDict;
-    };
-
-    // The order of the default event init dictionary keys is important, the
-    // arguments to initFooEvent is derived from that.
-    configureEventConstructor('Event', {bubbles: false, cancelable: false});
-    configureEventConstructor('CustomEvent', {detail: null}, 'Event');
-    configureEventConstructor('UIEvent', {view: null, detail: 0}, 'Event');
-    configureEventConstructor('MouseEvent', {
-      screenX: 0,
-      screenY: 0,
-      clientX: 0,
-      clientY: 0,
-      ctrlKey: false,
-      altKey: false,
-      shiftKey: false,
-      metaKey: false,
-      button: 0,
-      relatedTarget: null
-    }, 'UIEvent');
-    configureEventConstructor('FocusEvent', {relatedTarget: null}, 'UIEvent');
-  }
-
-  function isValidListener(fun) {
-    if (typeof fun === 'function')
-      return true;
-    return fun && fun.handleEvent;
-  }
-
-  var OriginalEventTarget = window.EventTarget;
-
-  /**
-   * This represents a wrapper for an EventTarget.
-   * @param {!EventTarget} impl The original event target.
-   * @constructor
-   */
-  function EventTarget(impl) {
-    this.impl = impl;
-  }
-
-  // Node and Window have different internal type checks in WebKit so we cannot
-  // use the same method as the original function.
-  var methodNames = [
-    'addEventListener',
-    'removeEventListener',
-    'dispatchEvent'
-  ];
-
-  [Element, Window, Document].forEach(function(constructor) {
-    var p = constructor.prototype;
-    methodNames.forEach(function(name) {
-      Object.defineProperty(p, name + '_', {value: p[name]});
-    });
-  });
-
-  function getTargetToListenAt(wrapper) {
-    if (wrapper instanceof wrappers.ShadowRoot)
-      wrapper = scope.getHostForShadowRoot(wrapper);
-    return unwrap(wrapper);
-  }
-
-  EventTarget.prototype = {
-    addEventListener: function(type, fun, capture) {
-      if (!isValidListener(fun))
-        return;
-
-      var listener = new Listener(type, fun, capture);
-      var listeners = listenersTable.get(this);
-      if (!listeners) {
-        listeners = [];
-        listenersTable.set(this, listeners);
-      } else {
-        // Might have a duplicate.
-        for (var i = 0; i < listeners.length; i++) {
-          if (listener.equals(listeners[i]))
-            return;
-        }
-      }
-
-      listeners.push(listener);
-
-      var target = getTargetToListenAt(this);
-      target.addEventListener_(type, dispatchOriginalEvent, true);
-    },
-    removeEventListener: function(type, fun, capture) {
-      capture = Boolean(capture);
-      var listeners = listenersTable.get(this);
-      if (!listeners)
-        return;
-      var count = 0, found = false;
-      for (var i = 0; i < listeners.length; i++) {
-        if (listeners[i].type === type && listeners[i].capture === capture) {
-          count++;
-          if (listeners[i].handler === fun) {
-            found = true;
-            listeners[i].remove();
-          }
-        }
-      }
-
-      if (found && count === 1) {
-        var target = getTargetToListenAt(this);
-        target.removeEventListener_(type, dispatchOriginalEvent, true);
-      }
-    },
-    dispatchEvent: function(event) {
-      scope.renderAllPending();
-      var target = getTargetToListenAt(this);
-      return target.dispatchEvent_(unwrap(event));
-    }
-  };
-
-  if (OriginalEventTarget)
-    registerWrapper(OriginalEventTarget, EventTarget);
-
-  function wrapEventTargetMethods(constructors) {
-    forwardMethodsToWrapper(constructors, methodNames);
-  }
-
-
-  var originalElementFromPoint = document.elementFromPoint;
-
-  function elementFromPoint(self, document, x, y) {
-    scope.renderAllPending();
-
-    var element = wrap(originalElementFromPoint.call(document.impl, x, y));
-    var targets = retarget(element, this)
-    for (var i = 0; i < targets.length; i++) {
-      var target = targets[i];
-      if (target.currentTarget === self)
-        return target.target;
-    }
-    return null;
-  }
-
-  scope.adjustRelatedTarget = adjustRelatedTarget;
-  scope.elementFromPoint = elementFromPoint;
-  scope.wrapEventTargetMethods = wrapEventTargetMethods;
-  scope.wrappers.CustomEvent = CustomEvent;
-  scope.wrappers.Event = Event;
-  scope.wrappers.EventTarget = EventTarget;
-  scope.wrappers.FocusEvent = FocusEvent;
-  scope.wrappers.MouseEvent = MouseEvent;
-  scope.wrappers.MutationEvent = MutationEvent;
-  scope.wrappers.UIEvent = UIEvent;
-
-})(this.ShadowDOMPolyfill);
-
-// Copyright 2012 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var wrap = scope.wrap;
-
-  function nonEnum(obj, prop) {
-    Object.defineProperty(obj, prop, {enumerable: false});
-  }
-
-  function NodeList() {
-    this.length = 0;
-    nonEnum(this, 'length');
-  }
-  NodeList.prototype = {
-    item: function(index) {
-      return this[index];
-    }
-  };
-  nonEnum(NodeList.prototype, 'item');
-
-  function wrapNodeList(list) {
-    if (list == null)
-      return list;
-    var wrapperList = new NodeList();
-    for (var i = 0, length = list.length; i < length; i++) {
-      wrapperList[i] = wrap(list[i]);
-    }
-    wrapperList.length = length;
-    return wrapperList;
-  }
-
-  function addWrapNodeListMethod(wrapperConstructor, name) {
-    wrapperConstructor.prototype[name] = function() {
-      return wrapNodeList(this.impl[name].apply(this.impl, arguments));
-    };
-  }
-
-  scope.wrappers.NodeList = NodeList;
-  scope.addWrapNodeListMethod = addWrapNodeListMethod;
-  scope.wrapNodeList = wrapNodeList;
-
-})(this.ShadowDOMPolyfill);
-// Copyright 2012 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var EventTarget = scope.wrappers.EventTarget;
-  var NodeList = scope.wrappers.NodeList;
-  var defineWrapGetter = scope.defineWrapGetter;
-  var assert = scope.assert;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var unwrap = scope.unwrap;
-  var wrap = scope.wrap;
-
-  function assertIsNodeWrapper(node) {
-    assert(node instanceof Node);
-  }
-
-  /**
-   * Collects nodes from a DocumentFragment or a Node for removal followed
-   * by an insertion.
-   *
-   * This updates the internal pointers for node, previousNode and nextNode.
-   */
-  function collectNodes(node, parentNode, previousNode, nextNode) {
-    if (node.nodeType !== Node.DOCUMENT_FRAGMENT_NODE) {
-      if (node.parentNode)
-        node.parentNode.removeChild(node);
-      node.parentNode_ = parentNode;
-      node.previousSibling_ = previousNode;
-      node.nextSibling_ = nextNode;
-      if (previousNode)
-        previousNode.nextSibling_ = node;
-      if (nextNode)
-        nextNode.previousSibling_ = node;
-      return [node];
-    }
-
-    var nodes = [];
-    var firstChild;
-    while (firstChild = node.firstChild) {
-      node.removeChild(firstChild);
-      nodes.push(firstChild);
-      firstChild.parentNode_ = parentNode;
-    }
-
-    for (var i = 0; i < nodes.length; i++) {
-      nodes[i].previousSibling_ = nodes[i - 1] || previousNode;
-      nodes[i].nextSibling_ = nodes[i + 1] || nextNode;
-    }
-
-    if (previousNode)
-      previousNode.nextSibling_ = nodes[0];
-    if (nextNode)
-      nextNode.previousSibling_ = nodes[nodes.length - 1];
-
-    return nodes;
-  }
-
-  function unwrapNodesForInsertion(nodes) {
-    if (nodes.length === 1)
-      return unwrap(nodes[0]);
-
-    var df = unwrap(document.createDocumentFragment());
-    for (var i = 0; i < nodes.length; i++) {
-      df.appendChild(unwrap(nodes[i]));
-    }
-    return df;
-  }
-
-  function removeAllChildNodes(wrapper) {
-    var childWrapper = wrapper.firstChild;
-    while (childWrapper) {
-      assert(childWrapper.parentNode === wrapper);
-      var nextSibling = childWrapper.nextSibling;
-      var childNode = unwrap(childWrapper);
-      var parentNode = childNode.parentNode;
-      if (parentNode)
-        originalRemoveChild.call(parentNode, childNode);
-      childWrapper.previousSibling_ = childWrapper.nextSibling_ = childWrapper.parentNode_ = null;
-      childWrapper = nextSibling;
-    }
-    wrapper.firstChild_ = wrapper.lastChild_ = null;
-  }
-
-  var OriginalNode = window.Node;
-
-  /**
-   * This represents a wrapper of a native DOM node.
-   * @param {!Node} original The original DOM node, aka, the visual DOM node.
-   * @constructor
-   * @extends {EventTarget}
-   */
-  function Node(original) {
-    assert(original instanceof OriginalNode);
-
-    EventTarget.call(this, original);
-
-    // These properties are used to override the visual references with the
-    // logical ones. If the value is undefined it means that the logical is the
-    // same as the visual.
-
-    /**
-     * @type {Node|undefined}
-     * @private
-     */
-    this.parentNode_ = undefined;
-
-    /**
-     * @type {Node|undefined}
-     * @private
-     */
-    this.firstChild_ = undefined;
-
-    /**
-     * @type {Node|undefined}
-     * @private
-     */
-    this.lastChild_ = undefined;
-
-    /**
-     * @type {Node|undefined}
-     * @private
-     */
-    this.nextSibling_ = undefined;
-
-    /**
-     * @type {Node|undefined}
-     * @private
-     */
-    this.previousSibling_ = undefined;
-  };
-
-  var originalAppendChild = OriginalNode.prototype.appendChild;
-  var originalInsertBefore = OriginalNode.prototype.insertBefore;
-  var originalReplaceChild = OriginalNode.prototype.replaceChild;
-  var originalRemoveChild = OriginalNode.prototype.removeChild;
-  var originalCompareDocumentPosition =
-      OriginalNode.prototype.compareDocumentPosition;
-
-  Node.prototype = Object.create(EventTarget.prototype);
-  mixin(Node.prototype, {
-    appendChild: function(childWrapper) {
-      assertIsNodeWrapper(childWrapper);
-
-      this.invalidateShadowRenderer();
-
-      var previousNode = this.lastChild;
-      var nextNode = null;
-      var nodes = collectNodes(childWrapper, this,
-                               previousNode, nextNode);
-
-      this.lastChild_ = nodes[nodes.length - 1];
-      if (!previousNode)
-        this.firstChild_ = nodes[0];
-
-      // TODO(arv): It is unclear if we need to update the visual DOM here.
-      // A better aproach might be to make sure we only get here for nodes that
-      // are related to a shadow host and then invalidate that and re-render
-      // the host (on reflow?).
-      originalAppendChild.call(this.impl, unwrapNodesForInsertion(nodes));
-
-      return childWrapper;
-    },
-
-    insertBefore: function(childWrapper, refWrapper) {
-      // TODO(arv): Unify with appendChild
-      if (!refWrapper)
-        return this.appendChild(childWrapper);
-
-      assertIsNodeWrapper(childWrapper);
-      assertIsNodeWrapper(refWrapper);
-      assert(refWrapper.parentNode === this);
-
-      this.invalidateShadowRenderer();
-
-      var previousNode = refWrapper.previousSibling;
-      var nextNode = refWrapper;
-      var nodes = collectNodes(childWrapper, this,
-                               previousNode, nextNode);
-
-
-      if (this.firstChild === refWrapper)
-        this.firstChild_ = nodes[0];
-
-      // insertBefore refWrapper no matter what the parent is?
-      var refNode = unwrap(refWrapper);
-      var parentNode = refNode.parentNode;
-      if (parentNode) {
-        originalInsertBefore.call(
-            parentNode,
-            unwrapNodesForInsertion(nodes),
-            refNode);
-      }
-
-      return childWrapper;
-    },
-
-    removeChild: function(childWrapper) {
-      assertIsNodeWrapper(childWrapper);
-      if (childWrapper.parentNode !== this) {
-        // TODO(arv): DOMException
-        throw new Error('NotFoundError');
-      }
-
-      this.invalidateShadowRenderer();
-
-      // We need to remove the real node from the DOM before updating the
-      // pointers. This is so that that mutation event is dispatched before
-      // the pointers have changed.
-      var thisFirstChild = this.firstChild;
-      var thisLastChild = this.lastChild;
-      var childWrapperNextSibling = childWrapper.nextSibling;
-      var childWrapperPreviousSibling = childWrapper.previousSibling;
-
-      var childNode = unwrap(childWrapper);
-      var parentNode = childNode.parentNode;
-      if (parentNode)
-        originalRemoveChild.call(parentNode, childNode);
-
-      if (thisFirstChild === childWrapper)
-        this.firstChild_ = childWrapperNextSibling;
-      if (thisLastChild === childWrapper)
-        this.lastChild_ = childWrapperPreviousSibling;
-      if (childWrapperPreviousSibling)
-        childWrapperPreviousSibling.nextSibling_ = childWrapperNextSibling;
-      if (childWrapperNextSibling)
-        childWrapperNextSibling.previousSibling_ = childWrapperPreviousSibling;
-
-      childWrapper.previousSibling_ = childWrapper.nextSibling_ = childWrapper.parentNode_ = null;
-
-      return childWrapper;
-    },
-
-    replaceChild: function(newChildWrapper, oldChildWrapper) {
-      assertIsNodeWrapper(newChildWrapper);
-      assertIsNodeWrapper(oldChildWrapper);
-
-      if (oldChildWrapper.parentNode !== this) {
-        // TODO(arv): DOMException
-        throw new Error('NotFoundError');
-      }
-
-      this.invalidateShadowRenderer();
-
-      var previousNode = oldChildWrapper.previousSibling;
-      var nextNode = oldChildWrapper.nextSibling;
-      if (nextNode === newChildWrapper)
-        nextNode = newChildWrapper.nextSibling;
-      var nodes = collectNodes(newChildWrapper, this,
-                               previousNode, nextNode);
-
-      if (this.firstChild === oldChildWrapper)
-        this.firstChild_ = nodes[0];
-      if (this.lastChild === oldChildWrapper)
-        this.lastChild_ = nodes[nodes.length - 1];
-
-      oldChildWrapper.previousSibling_ = null;
-      oldChildWrapper.nextSibling_ = null;
-      oldChildWrapper.parentNode_ = null;
-
-      // replaceChild no matter what the parent is?
-      var oldChildNode = unwrap(oldChildWrapper);
-      if (oldChildNode.parentNode) {
-        originalReplaceChild.call(
-            oldChildNode.parentNode,
-            unwrapNodesForInsertion(nodes),
-            oldChildNode);
-      }
-
-      return oldChildWrapper;
-    },
-
-    hasChildNodes: function() {
-      return this.firstChild === null;
-    },
-
-    /** @type {Node} */
-    get parentNode() {
-      // If the parentNode has not been overridden, use the original parentNode.
-      return this.parentNode_ !== undefined ?
-          this.parentNode_ : wrap(this.impl.parentNode);
-    },
-
-    /** @type {Node} */
-    get firstChild() {
-      return this.firstChild_ !== undefined ?
-          this.firstChild_ : wrap(this.impl.firstChild);
-    },
-
-    /** @type {Node} */
-    get lastChild() {
-      return this.lastChild_ !== undefined ?
-          this.lastChild_ : wrap(this.impl.lastChild);
-    },
-
-    /** @type {Node} */
-    get nextSibling() {
-      return this.nextSibling_ !== undefined ?
-          this.nextSibling_ : wrap(this.impl.nextSibling);
-    },
-
-    /** @type {Node} */
-    get previousSibling() {
-      return this.previousSibling_ !== undefined ?
-          this.previousSibling_ : wrap(this.impl.previousSibling);
-    },
-
-    get parentElement() {
-      var p = this.parentNode;
-      while (p && p.nodeType !== Node.ELEMENT_NODE) {
-        p = p.parentNode;
-      }
-      return p;
-    },
-
-    get textContent() {
-      // TODO(arv): This should fallback to this.impl.textContent if there
-      // are no shadow trees below or above the context node.
-      var s = '';
-      for (var child = this.firstChild; child; child = child.nextSibling) {
-        s += child.textContent;
-      }
-      return s;
-    },
-    set textContent(textContent) {
-      removeAllChildNodes(this);
-      this.invalidateShadowRenderer();
-      if (textContent !== '') {
-        var textNode = this.impl.ownerDocument.createTextNode(textContent);
-        this.appendChild(textNode);
-      }
-    },
-
-    get childNodes() {
-      var wrapperList = new NodeList();
-      var i = 0;
-      for (var child = this.firstChild; child; child = child.nextSibling) {
-        wrapperList[i++] = child;
-      }
-      wrapperList.length = i;
-      return wrapperList;
-    },
-
-    cloneNode: function(deep) {
-      if (!this.invalidateShadowRenderer())
-        return wrap(this.impl.cloneNode(deep));
-
-      var clone = wrap(this.impl.cloneNode(false));
-      if (deep) {
-        for (var child = this.firstChild; child; child = child.nextSibling) {
-          clone.appendChild(child.cloneNode(true));
-        }
-      }
-      // TODO(arv): Some HTML elements also clone other data like value.
-      return clone;
-    },
-
-    // insertionParent is added in ShadowRender.js
-
-    contains: function(child) {
-      if (!child)
-        return false;
-
-      // TODO(arv): Optimize using ownerDocument etc.
-      if (child === this)
-        return true;
-      var parentNode = child.parentNode;
-      if (!parentNode)
-        return false;
-      return this.contains(parentNode);
-    },
-
-    compareDocumentPosition: function(otherNode) {
-      // This only wraps, it therefore only operates on the composed DOM and not
-      // the logical DOM.
-      return originalCompareDocumentPosition.call(this.impl, unwrap(otherNode));
-    }
-  });
-
-  defineWrapGetter(Node, 'ownerDocument');
-
-  // We use a DocumentFragment as a base and then delete the properties of
-  // DocumentFragment.prototype from the wrapper Node. Since delete makes
-  // objects slow in some JS engines we recreate the prototype object.
-  registerWrapper(OriginalNode, Node, document.createDocumentFragment());
-  delete Node.prototype.querySelector;
-  delete Node.prototype.querySelectorAll;
-  Node.prototype = mixin(Object.create(EventTarget.prototype), Node.prototype);
-
-  scope.wrappers.Node = Node;
-
-})(this.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  function findOne(node, selector) {
-    var m, el = node.firstElementChild;
-    while (el) {
-      if (el.matches(selector))
-        return el;
-      m = findOne(el, selector);
-      if (m)
-        return m;
-      el = el.nextElementSibling;
-    }
-    return null;
-  }
-
-  function findAll(node, selector, results) {
-    var el = node.firstElementChild;
-    while (el) {
-      if (el.matches(selector))
-        results[results.length++] = el;
-      findAll(el, selector, results);
-      el = el.nextElementSibling;
-    }
-    return results;
-  }
-
-  // find and findAll will only match Simple Selectors,
-  // Structural Pseudo Classes are not guarenteed to be correct
-  // http://www.w3.org/TR/css3-selectors/#simple-selectors
-
-  var SelectorsInterface = {
-    querySelector: function(selector) {
-      return findOne(this, selector);
-    },
-    querySelectorAll: function(selector) {
-      return findAll(this, selector, new NodeList())
-    }
-  };
-
-  var GetElementsByInterface = {
-    getElementsByTagName: function(tagName) {
-      // TODO(arv): Check tagName?
-      return this.querySelectorAll(tagName);
-    },
-    getElementsByClassName: function(className) {
-      // TODO(arv): Check className?
-      return this.querySelectorAll('.' + className);
-    },
-    getElementsByTagNameNS: function(ns, tagName) {
-      if (ns === '*')
-        return this.getElementsByTagName(tagName);
-
-      // TODO(arv): Check tagName?
-      var result = new NodeList;
-      var els = this.getElementsByTagName(tagName);
-      for (var i = 0, j = 0; i < els.length; i++) {
-        if (els[i].namespaceURI === ns)
-          result[j++] = els[i];
-      }
-      result.length = j;
-      return result;
-    }
-  };
-
-  scope.GetElementsByInterface = GetElementsByInterface;
-  scope.SelectorsInterface = SelectorsInterface;
-
-})(this.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var NodeList = scope.wrappers.NodeList;
-
-  function forwardElement(node) {
-    while (node && node.nodeType !== Node.ELEMENT_NODE) {
-      node = node.nextSibling;
-    }
-    return node;
-  }
-
-  function backwardsElement(node) {
-    while (node && node.nodeType !== Node.ELEMENT_NODE) {
-      node = node.previousSibling;
-    }
-    return node;
-  }
-
-  var ParentNodeInterface = {
-    get firstElementChild() {
-      return forwardElement(this.firstChild);
-    },
-
-    get lastElementChild() {
-      return backwardsElement(this.lastChild);
-    },
-
-    get childElementCount() {
-      var count = 0;
-      for (var child = this.firstElementChild;
-           child;
-           child = child.nextElementSibling) {
-        count++;
-      }
-      return count;
-    },
-
-    get children() {
-      var wrapperList = new NodeList();
-      var i = 0;
-      for (var child = this.firstElementChild;
-           child;
-           child = child.nextElementSibling) {
-        wrapperList[i++] = child;
-      }
-      wrapperList.length = i;
-      return wrapperList;
-    }
-  };
-
-  var ChildNodeInterface = {
-    get nextElementSibling() {
-      return forwardElement(this.nextSibling);
-    },
-
-    get previousElementSibling() {
-      return backwardsElement(this.nextSibling);
-    }
-  };
-
-  scope.ChildNodeInterface = ChildNodeInterface;
-  scope.ParentNodeInterface = ParentNodeInterface;
-
-})(this.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var ChildNodeInterface = scope.ChildNodeInterface;
-  var Node = scope.wrappers.Node;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-
-  var OriginalCharacterData = window.CharacterData;
-
-  function CharacterData(node) {
-    Node.call(this, node);
-  }
-  CharacterData.prototype = Object.create(Node.prototype);
-  mixin(CharacterData.prototype, {
-    get textContent() {
-      return this.data;
-    },
-    set textContent(value) {
-      this.data = value;
-    }
-  });
-
-  mixin(CharacterData.prototype, ChildNodeInterface);
-
-  registerWrapper(OriginalCharacterData, CharacterData,
-                  document.createTextNode(''));
-
-  scope.wrappers.CharacterData = CharacterData;
-})(this.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var ChildNodeInterface = scope.ChildNodeInterface;
-  var GetElementsByInterface = scope.GetElementsByInterface;
-  var Node = scope.wrappers.Node;
-  var ParentNodeInterface = scope.ParentNodeInterface;
-  var SelectorsInterface = scope.SelectorsInterface;
-  var addWrapNodeListMethod = scope.addWrapNodeListMethod;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var wrappers = scope.wrappers;
-
-  var shadowRootTable = new SideTable();
-  var OriginalElement = window.Element;
-
-  var originalMatches =
-      OriginalElement.prototype.matches ||
-      OriginalElement.prototype.mozMatchesSelector ||
-      OriginalElement.prototype.msMatchesSelector ||
-      OriginalElement.prototype.webkitMatchesSelector;
-
-  function Element(node) {
-    Node.call(this, node);
-  }
-  Element.prototype = Object.create(Node.prototype);
-  mixin(Element.prototype, {
-    createShadowRoot: function() {
-      var newShadowRoot = new wrappers.ShadowRoot(this);
-      shadowRootTable.set(this, newShadowRoot);
-
-      scope.getRendererForHost(this);
-
-      this.invalidateShadowRenderer(true);
-
-      return newShadowRoot;
-    },
-
-    get shadowRoot() {
-      return shadowRootTable.get(this) || null;
-    },
-
-    setAttribute: function(name, value) {
-      this.impl.setAttribute(name, value);
-      // This is a bit agressive. We need to invalidate if it affects
-      // the rendering content[select] or if it effects the value of a content
-      // select.
-      this.invalidateShadowRenderer();
-    },
-
-    matches: function(selector) {
-      return originalMatches.call(this.impl, selector);
-    }
-  });
-
-  mixin(Element.prototype, ChildNodeInterface);
-  mixin(Element.prototype, GetElementsByInterface);
-  mixin(Element.prototype, ParentNodeInterface);
-  mixin(Element.prototype, SelectorsInterface);
-
-  registerWrapper(OriginalElement, Element);
-
-  scope.wrappers.Element = Element;
-})(this.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var Element = scope.wrappers.Element;
-  var defineGetter = scope.defineGetter;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var unwrap = scope.unwrap;
-  var wrap = scope.wrap;
-
-  /////////////////////////////////////////////////////////////////////////////
-  // innerHTML and outerHTML
-
-  var escapeRegExp = /&|<|"/g;
-
-  function escapeReplace(c) {
-    switch (c) {
-      case '&':
-        return '&amp;';
-      case '<':
-        return '&lt;';
-      case '"':
-        return '&quot;'
-    }
-  }
-
-  function escape(s) {
-    return s.replace(escapeRegExp, escapeReplace);
-  }
-
-  // http://www.whatwg.org/specs/web-apps/current-work/#void-elements
-  var voidElements = {
-    'area': true,
-    'base': true,
-    'br': true,
-    'col': true,
-    'command': true,
-    'embed': true,
-    'hr': true,
-    'img': true,
-    'input': true,
-    'keygen': true,
-    'link': true,
-    'meta': true,
-    'param': true,
-    'source': true,
-    'track': true,
-    'wbr': true
-  };
-
-  function getOuterHTML(node) {
-    switch (node.nodeType) {
-      case Node.ELEMENT_NODE:
-        var tagName = node.tagName.toLowerCase();
-        var s = '<' + tagName;
-        var attrs = node.attributes;
-        for (var i = 0, attr; attr = attrs[i]; i++) {
-          s += ' ' + attr.name + '="' + escape(attr.value) + '"';
-        }
-        s += '>';
-        if (voidElements[tagName])
-          return s;
-
-        return s + getInnerHTML(node) + '</' + tagName + '>';
-
-      case Node.TEXT_NODE:
-        return escape(node.nodeValue);
-
-      case Node.COMMENT_NODE:
-        return '<!--' + escape(node.nodeValue) + '-->';
-      default:
-        console.error(node);
-        throw new Error('not implemented');
-    }
-  }
-
-  function getInnerHTML(node) {
-    var s = '';
-    for (var child = node.firstChild; child; child = child.nextSibling) {
-      s += getOuterHTML(child);
-    }
-    return s;
-  }
-
-  function setInnerHTML(node, value, opt_tagName) {
-    var tagName = opt_tagName || 'div';
-    node.textContent = '';
-    var tempElement =unwrap(node.ownerDocument.createElement(tagName));
-    tempElement.innerHTML = value;
-    var firstChild;
-    while (firstChild = tempElement.firstChild) {
-      node.appendChild(wrap(firstChild));
-    }
-  }
-
-  var OriginalHTMLElement = window.HTMLElement;
-
-  function HTMLElement(node) {
-    Element.call(this, node);
-  }
-  HTMLElement.prototype = Object.create(Element.prototype);
-  mixin(HTMLElement.prototype, {
-    get innerHTML() {
-      // TODO(arv): This should fallback to this.impl.innerHTML if there
-      // are no shadow trees below or above the context node.
-      return getInnerHTML(this);
-    },
-    set innerHTML(value) {
-      setInnerHTML(this, value, this.tagName);
-    },
-
-    get outerHTML() {
-      // TODO(arv): This should fallback to HTMLElement_prototype.outerHTML if there
-      // are no shadow trees below or above the context node.
-      return getOuterHTML(this);
-    },
-    set outerHTML(value) {
-      if (!this.invalidateShadowRenderer()) {
-        this.impl.outerHTML = value;
-      } else {
-        throw new Error('not implemented');
-      }
-    }
-  });
-
-  function getterRequiresRendering(name) {
-    defineGetter(HTMLElement, name, function() {
-      scope.renderAllPending();
-      return this.impl[name];
-     });
-  }
-
-  [
-    'clientHeight',
-    'clientLeft',
-    'clientTop',
-    'clientWidth',
-    'offsetHeight',
-    'offsetLeft',
-    'offsetTop',
-    'offsetWidth',
-    'scrollHeight',
-    'scrollLeft',
-    'scrollTop',
-    'scrollWidth',
-  ].forEach(getterRequiresRendering);
-
-  function methodRequiresRendering(name) {
-    Object.defineProperty(HTMLElement.prototype, name, {
-      value: function() {
-        scope.renderAllPending();
-        return this.impl[name].apply(this.impl, arguments);
-      },
-      configurable: true,
-      enumerable: true
-    });
-  }
-
-  [
-    'getBoundingClientRect',
-    'getClientRects',
-    'scrollIntoView'
-  ].forEach(methodRequiresRendering);
-
-  // HTMLElement is abstract so we use a subclass that has no members.
-  registerWrapper(OriginalHTMLElement, HTMLElement,
-                  document.createElement('b'));
-
-  scope.wrappers.HTMLElement = HTMLElement;
-
-  // TODO: Find a better way to share these two with WrapperShadowRoot.
-  scope.getInnerHTML = getInnerHTML;
-  scope.setInnerHTML = setInnerHTML
-})(this.ShadowDOMPolyfill);
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-
-  var OriginalHTMLContentElement = window.HTMLContentElement;
-
-  function HTMLContentElement(node) {
-    HTMLElement.call(this, node);
-  }
-  HTMLContentElement.prototype = Object.create(HTMLElement.prototype);
-  mixin(HTMLContentElement.prototype, {
-    get select() {
-      return this.getAttribute('select');
-    },
-    set select(value) {
-      this.setAttribute('select', value);
-    },
-
-    setAttribute: function(n, v) {
-      HTMLElement.prototype.setAttribute.call(this, n, v);
-      if (String(n).toLowerCase() === 'select')
-        this.invalidateShadowRenderer(true);
-    }
-
-    // getDistributedNodes is added in ShadowRenderer
-
-    // TODO: attribute boolean resetStyleInheritance;
-  });
-
-  if (OriginalHTMLContentElement)
-    registerWrapper(OriginalHTMLContentElement, HTMLContentElement);
-
-  scope.wrappers.HTMLContentElement = HTMLContentElement;
-})(this.ShadowDOMPolyfill);
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-
-  var OriginalHTMLShadowElement = window.HTMLShadowElement;
-
-  function HTMLShadowElement(node) {
-    HTMLElement.call(this, node);
-    this.olderShadowRoot_ = null;
-  }
-  HTMLShadowElement.prototype = Object.create(HTMLElement.prototype);
-  mixin(HTMLShadowElement.prototype, {
-    get olderShadowRoot() {
-      return this.olderShadowRoot_;
-    },
-
-    invalidateShadowRenderer: function() {
-      HTMLElement.prototype.invalidateShadowRenderer.call(this, true);
-    },
-
-    // TODO: attribute boolean resetStyleInheritance;
-  });
-
-  if (OriginalHTMLShadowElement)
-    registerWrapper(OriginalHTMLShadowElement, HTMLShadowElement);
-
-  scope.wrappers.HTMLShadowElement = HTMLShadowElement;
-})(this.ShadowDOMPolyfill);
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var getInnerHTML = scope.getInnerHTML;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var setInnerHTML = scope.setInnerHTML;
-  var wrap = scope.wrap;
-
-  var contentTable = new SideTable();
-  var templateContentsOwnerTable = new SideTable();
-
-  // http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/templates/index.html#dfn-template-contents-owner
-  function getTemplateContentsOwner(doc) {
-    if (!doc.defaultView)
-      return doc;
-    var d = templateContentsOwnerTable.get(doc);
-    if (!d) {
-      // TODO(arv): This should either be a Document or HTMLDocument depending
-      // on doc.
-      d = doc.implementation.createHTMLDocument('');
-      while (d.lastChild) {
-        d.removeChild(d.lastChild);
-      }
-      templateContentsOwnerTable.set(doc, d);
-    }
-    return d;
-  }
-
-  function extractContent(templateElement) {
-    var doc = getTemplateContentsOwner(templateElement.ownerDocument);
-    var df = doc.createDocumentFragment();
-    var nextSibling;
-    var child;
-    while (child = templateElement.firstChild) {
-      df.appendChild(child);
-    }
-    return df;
-  }
-
-  var OriginalHTMLTemplateElement = window.HTMLTemplateElement;
-
-  function HTMLTemplateElement(node) {
-    HTMLElement.call(this, node);
-  }
-  HTMLTemplateElement.prototype = Object.create(HTMLElement.prototype);
-
-  mixin(HTMLTemplateElement.prototype, {
-    get content() {
-      if (OriginalHTMLTemplateElement)
-        return wrap(this.impl.content);
-
-      // TODO(arv): This should be done in createCallback. I initially tried to
-      // do this in the constructor but the wrapper is not yet created at that
-      // point in time so we hit an iloop.
-      var content = contentTable.get(this);
-      if (!content) {
-        content = extractContent(this);
-        contentTable.set(this, content);
-      }
-      return content;
-    },
-
-    get innerHTML() {
-      return getInnerHTML(this.content);
-    },
-    set innerHTML(value) {
-      setInnerHTML(this.content, value);
-      this.invalidateShadowRenderer();
-    }
-
-    // TODO(arv): cloneNode needs to clone content.
-
-  });
-
-  if (OriginalHTMLTemplateElement)
-    registerWrapper(OriginalHTMLTemplateElement, HTMLTemplateElement);
-
-  scope.wrappers.HTMLTemplateElement = HTMLTemplateElement;
-})(this.ShadowDOMPolyfill);
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var HTMLContentElement = scope.wrappers.HTMLContentElement;
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var HTMLShadowElement = scope.wrappers.HTMLShadowElement;
-  var HTMLTemplateElement = scope.wrappers.HTMLTemplateElement;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-
-  var OriginalHTMLUnknownElement = window.HTMLUnknownElement;
-
-  function HTMLUnknownElement(node) {
-    switch (node.localName) {
-      case 'content':
-        return new HTMLContentElement(node);
-      case 'shadow':
-        return new HTMLShadowElement(node);
-      case 'template':
-        return new HTMLTemplateElement(node);
-    }
-    HTMLElement.call(this, node);
-  }
-  HTMLUnknownElement.prototype = Object.create(HTMLElement.prototype);
-  registerWrapper(OriginalHTMLUnknownElement, HTMLUnknownElement);
-  scope.wrappers.HTMLUnknownElement = HTMLUnknownElement;
-})(this.ShadowDOMPolyfill);
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var GetElementsByInterface = scope.GetElementsByInterface;
-  var ParentNodeInterface = scope.ParentNodeInterface;
-  var SelectorsInterface = scope.SelectorsInterface;
-  var mixin = scope.mixin;
-  var registerObject = scope.registerObject;
-
-  var DocumentFragment = registerObject(document.createDocumentFragment());
-  mixin(DocumentFragment.prototype, ParentNodeInterface);
-  mixin(DocumentFragment.prototype, SelectorsInterface);
-  mixin(DocumentFragment.prototype, GetElementsByInterface);
-
-  var Text = registerObject(document.createTextNode(''));
-  var Comment = registerObject(document.createComment(''));
-
-  scope.wrappers.Comment = Comment;
-  scope.wrappers.DocumentFragment = DocumentFragment;
-  scope.wrappers.Text = Text;
-
-})(this.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var DocumentFragment = scope.wrappers.DocumentFragment;
-  var elementFromPoint = scope.elementFromPoint;
-  var getInnerHTML = scope.getInnerHTML;
-  var mixin = scope.mixin;
-  var rewrap = scope.rewrap;
-  var setInnerHTML = scope.setInnerHTML;
-  var unwrap = scope.unwrap;
-
-  var shadowHostTable = new SideTable();
-
-  function ShadowRoot(hostWrapper) {
-    var node = unwrap(hostWrapper.impl.ownerDocument.createDocumentFragment());
-    DocumentFragment.call(this, node);
-
-    // createDocumentFragment associates the node with a wrapper
-    // DocumentFragment instance. Override that.
-    rewrap(node, this);
-
-    var oldShadowRoot = hostWrapper.shadowRoot;
-    scope.nextOlderShadowTreeTable.set(this, oldShadowRoot);
-
-    shadowHostTable.set(this, hostWrapper);
-  }
-  ShadowRoot.prototype = Object.create(DocumentFragment.prototype);
-  mixin(ShadowRoot.prototype, {
-    get innerHTML() {
-      return getInnerHTML(this);
-    },
-    set innerHTML(value) {
-      setInnerHTML(this, value);
-      this.invalidateShadowRenderer();
-    },
-
-    invalidateShadowRenderer: function() {
-      return shadowHostTable.get(this).invalidateShadowRenderer();
-    },
-
-    elementFromPoint: function(x, y) {
-      return elementFromPoint(this, this.ownerDocument, x, y);
-    },
-
-    getElementById: function(id) {
-      return this.querySelector('#' + id);
-    }
-  });
-
-  scope.wrappers.ShadowRoot = ShadowRoot;
-  scope.getHostForShadowRoot = function(node) {
-    return shadowHostTable.get(node);
-  };
-})(this.ShadowDOMPolyfill);
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var HTMLContentElement = scope.wrappers.HTMLContentElement;
-  var Node = scope.wrappers.Node;
-  var assert = scope.assert;
-  var mixin = scope.mixin;
-  var unwrap = scope.unwrap;
-  var wrap = scope.wrap;
-
-  /**
-   * Updates the fields of a wrapper to a snapshot of the logical DOM as needed.
-   * Up means parentNode
-   * Sideways means previous and next sibling.
-   * @param {!Node} wrapper
-   */
-  function updateWrapperUpAndSideways(wrapper) {
-    wrapper.previousSibling_ = wrapper.previousSibling;
-    wrapper.nextSibling_ = wrapper.nextSibling;
-    wrapper.parentNode_ = wrapper.parentNode;
-  }
-
-  /**
-   * Updates the fields of a wrapper to a snapshot of the logical DOM as needed.
-   * Down means first and last child
-   * @param {!Node} wrapper
-   */
-  function updateWrapperDown(wrapper) {
-    wrapper.firstChild_ = wrapper.firstChild;
-    wrapper.lastChild_ = wrapper.lastChild;
-  }
-
-  function updateAllChildNodes(parentNodeWrapper) {
-    assert(parentNodeWrapper instanceof Node);
-    for (var childWrapper = parentNodeWrapper.firstChild;
-         childWrapper;
-         childWrapper = childWrapper.nextSibling) {
-      updateWrapperUpAndSideways(childWrapper);
-    }
-    updateWrapperDown(parentNodeWrapper);
-  }
-
-  // This object groups DOM operations. This is supposed to be the DOM as the
-  // browser/render tree sees it.
-  // When changes are done to the visual DOM the logical DOM needs to be updated
-  // to reflect the correct tree.
-  function removeAllChildNodes(parentNodeWrapper) {
-    var parentNode = unwrap(parentNodeWrapper);
-    updateAllChildNodes(parentNodeWrapper);
-    parentNode.textContent = '';
-  }
-
-  function appendChild(parentNodeWrapper, childWrapper) {
-    var parentNode = unwrap(parentNodeWrapper);
-    var child = unwrap(childWrapper);
-    if (child.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
-      updateAllChildNodes(childWrapper);
-
-    } else {
-      remove(childWrapper);
-      updateWrapperUpAndSideways(childWrapper);
-    }
-
-    parentNodeWrapper.lastChild_ = parentNodeWrapper.lastChild;
-    if (parentNodeWrapper.lastChild === parentNodeWrapper.firstChild)
-      parentNodeWrapper.firstChild_ = parentNodeWrapper.firstChild;
-
-    var lastChildWrapper = wrap(parentNode.lastChild);
-    if (lastChildWrapper) {
-      lastChildWrapper.nextSibling_ = lastChildWrapper.nextSibling;
-    }
-
-    parentNode.appendChild(child);
-  }
-
-  function removeChild(parentNodeWrapper, childWrapper) {
-    var parentNode = unwrap(parentNodeWrapper);
-    var child = unwrap(childWrapper);
-
-    updateWrapperUpAndSideways(childWrapper);
-
-    if (childWrapper.previousSibling)
-      childWrapper.previousSibling.nextSibling_ = childWrapper;
-    if (childWrapper.nextSibling)
-      childWrapper.nextSibling.previousSibling_ = childWrapper;
-
-    if (parentNodeWrapper.lastChild === childWrapper)
-      parentNodeWrapper.lastChild_ = childWrapper;
-    if (parentNodeWrapper.firstChild === childWrapper)
-      parentNodeWrapper.firstChild_ = childWrapper;
-
-    parentNode.removeChild(child);
-  }
-
-  function remove(nodeWrapper) {
-    var node = unwrap(nodeWrapper)
-    var parentNode = node.parentNode;
-    if (parentNode)
-      removeChild(wrap(parentNode), nodeWrapper);
-  }
-
-  var distributedChildNodesTable = new SideTable();
-  var eventParentsTable = new SideTable();
-  var insertionParentTable = new SideTable();
-  var nextOlderShadowTreeTable = new SideTable();
-  var rendererForHostTable = new SideTable();
-  var shadowDOMRendererTable = new SideTable();
-
-  var reprCounter = 0;
-
-  function repr(node) {
-    if (!node.displayName)
-      node.displayName = node.nodeName + '-' + ++reprCounter;
-    return node.displayName;
-  }
-
-  function distributeChildToInsertionPoint(child, insertionPoint) {
-    getDistributedChildNodes(insertionPoint).push(child);
-    insertionParentTable.set(child, insertionPoint);
-
-    var eventParents = eventParentsTable.get(child);
-    if (!eventParents)
-      eventParentsTable.set(child, eventParents = []);
-    eventParents.push(insertionPoint);
-  }
-
-  function resetDistributedChildNodes(insertionPoint) {
-    distributedChildNodesTable.set(insertionPoint, []);
-  }
-
-  function getDistributedChildNodes(insertionPoint) {
-    return distributedChildNodesTable.get(insertionPoint);
-  }
-
-  function getChildNodesSnapshot(node) {
-    var result = [], i = 0;
-    for (var child = node.firstChild; child; child = child.nextSibling) {
-      result[i++] = child;
-    }
-    return result;
-  }
-
-  /**
-   * Visits all nodes in the tree that fulfils the |predicate|. If the |visitor|
-   * function returns |false| the traversal is aborted.
-   * @param {!Node} tree
-   * @param {function(!Node) : boolean} predicate
-   * @param {function(!Node) : *} visitor
-   */
-  function visit(tree, predicate, visitor) {
-    // This operates on logical DOM.
-    var nodes = getChildNodesSnapshot(tree);
-    for (var i = 0; i < nodes.length; i++) {
-      var node = nodes[i];
-      if (predicate(node)) {
-        if (visitor(node) === false)
-          return;
-      } else {
-        visit(node, predicate, visitor);
-      }
-    }
-  }
-
-  // http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#dfn-distribution-algorithm
-  function distribute(tree, pool) {
-    var anyRemoved = false;
-
-    visit(tree, isActiveInsertionPoint,
-        function(insertionPoint) {
-          resetDistributedChildNodes(insertionPoint);
-          for (var i = 0; i < pool.length; i++) {  // 1.2
-            var node = pool[i];  // 1.2.1
-            if (node === undefined)  // removed
-              continue;
-            if (matchesCriteria(node, insertionPoint)) {  // 1.2.2
-              distributeChildToInsertionPoint(node, insertionPoint);  // 1.2.2.1
-              pool[i] = undefined;  // 1.2.2.2
-              anyRemoved = true;
-            }
-          }
-        });
-
-    if (!anyRemoved)
-      return pool;
-
-    return pool.filter(function(item) {
-      return item !== undefined;
-    });
-  }
-
-  // Matching Insertion Points
-  // http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#matching-insertion-points
-
-  // TODO(arv): Verify this... I don't remember why I picked this regexp.
-  var selectorMatchRegExp = /^[*.:#[a-zA-Z_|]/;
-
-  var allowedPseudoRegExp = new RegExp('^:(' + [
-    'link',
-    'visited',
-    'target',
-    'enabled',
-    'disabled',
-    'checked',
-    'indeterminate',
-    'nth-child',
-    'nth-last-child',
-    'nth-of-type',
-    'nth-last-of-type',
-    'first-child',
-    'last-child',
-    'first-of-type',
-    'last-of-type',
-    'only-of-type',
-  ].join('|') + ')');
-
-
-  function oneOf(object, propertyNames) {
-    for (var i = 0; i < propertyNames.length; i++) {
-      if (propertyNames[i] in object)
-        return propertyNames[i];
-    }
-  }
-
-  /**
-   * @param {Element} node
-   * @oaram {Element} point The insertion point element.
-   * @return {boolean} Whether the node matches the insertion point.
-   */
-  function matchesCriteria(node, point) {
-    var select = point.getAttribute('select');
-    if (!select)
-      return true;
-
-    // Here we know the select attribute is a non empty string.
-    select = select.trim();
-    if (!select)
-      return true;
-
-    if (node.nodeType !== Node.ELEMENT_NODE)
-      return false;
-
-    // TODO(arv): This does not seem right. Need to check for a simple selector.
-    if (!selectorMatchRegExp.test(select))
-      return false;
-
-    if (select[0] === ':' &&!allowedPseudoRegExp.test(select))
-      return false;
-
-    try {
-      return node.matches(select);
-    } catch (ex) {
-      // Invalid selector.
-      return false;
-    }
-  }
-
-  var request = oneOf(window, [
-    'requestAnimationFrame',
-    'mozRequestAnimationFrame',
-    'webkitRequestAnimationFrame',
-    'setTimeout'
-  ]);
-
-  var pendingDirtyRenderers = [];
-  var renderTimer;
-
-  function renderAllPending() {
-    renderTimer = null;
-    pendingDirtyRenderers.forEach(function(owner) {
-      owner.render();
-    });
-    pendingDirtyRenderers = [];
-  }
-
-  function ShadowRenderer(host) {
-    this.host = host;
-    this.dirty = false;
-    this.associateNode(host);
-  }
-
-  function getRendererForHost(host) {
-    var renderer = rendererForHostTable.get(host);
-    if (!renderer) {
-      renderer = new ShadowRenderer(host);
-      rendererForHostTable.set(host, renderer);
-    }
-    return renderer;
-  }
-
-  ShadowRenderer.prototype = {
-    // http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#rendering-shadow-trees
-    render: function() {
-      if (!this.dirty)
-        return;
-
-      var host = this.host;
-      this.treeComposition();
-      var shadowDOM = host.shadowRoot;
-      if (!shadowDOM)
-        return;
-
-      this.removeAllChildNodes(this.host);
-
-      var shadowDOMChildNodes = getChildNodesSnapshot(shadowDOM);
-      shadowDOMChildNodes.forEach(function(node) {
-        this.renderNode(host, shadowDOM, node, false);
-      }, this);
-
-      this.dirty = false;
-    },
-
-    invalidate: function() {
-      if (!this.dirty) {
-        this.dirty = true;
-        pendingDirtyRenderers.push(this);
-        if (renderTimer)
-          return;
-        renderTimer = window[request](renderAllPending, 0);
-      }
-    },
-
-    renderNode: function(visualParent, tree, node, isNested) {
-      if (isShadowHost(node)) {
-        this.appendChild(visualParent, node);
-        var renderer = getRendererForHost(node);
-        renderer.dirty = true;  // Need to rerender due to reprojection.
-        renderer.render();
-      } else if (isInsertionPoint(node)) {
-        this.renderInsertionPoint(visualParent, tree, node, isNested);
-      } else if (isShadowInsertionPoint(node)) {
-        this.renderShadowInsertionPoint(visualParent, tree, node);
-      } else {
-        this.renderAsAnyDomTree(visualParent, tree, node, isNested);
-      }
-    },
-
-    renderAsAnyDomTree: function(visualParent, tree, child, isNested) {
-      this.appendChild(visualParent, child);
-
-      if (isShadowHost(child)) {
-        render(child);
-      } else {
-        var parent = child;
-        var logicalChildNodes = getChildNodesSnapshot(parent);
-        logicalChildNodes.forEach(function(node) {
-          this.renderNode(parent, tree, node, isNested);
-        }, this);
-      }
-    },
-
-    renderInsertionPoint: function(visualParent, tree, insertionPoint, isNested) {
-      var distributedChildNodes = getDistributedChildNodes(insertionPoint);
-      if (distributedChildNodes.length) {
-        this.removeAllChildNodes(insertionPoint);
-
-        distributedChildNodes.forEach(function(child) {
-          if (isInsertionPoint(child) && isNested)
-            this.renderInsertionPoint(visualParent, tree, child, isNested);
-          else
-            this.renderAsAnyDomTree(visualParent, tree, child, isNested);
-        }, this);
-      } else {
-        this.renderFallbackContent(visualParent, insertionPoint);
-      }
-      this.remove(insertionPoint);
-    },
-
-    renderShadowInsertionPoint: function(visualParent, tree, shadowInsertionPoint) {
-      var nextOlderTree = getNextOlderTree(tree);
-      if (nextOlderTree) {
-        // This makes ShadowRoot have its insertionParent be the <shadow>.
-        insertionParentTable.set(nextOlderTree, shadowInsertionPoint);
-        shadowInsertionPoint.olderShadowRoot_ = nextOlderTree;
-        this.remove(shadowInsertionPoint);
-        var shadowDOMChildNodes = getChildNodesSnapshot(nextOlderTree);
-        shadowDOMChildNodes.forEach(function(node) {
-          this.renderNode(visualParent, nextOlderTree, node, true);
-        }, this);
-      } else {
-        this.renderFallbackContent(visualParent, shadowInsertionPoint);
-      }
-    },
-
-    renderFallbackContent: function (visualParent, fallbackHost) {
-      var logicalChildNodes = getChildNodesSnapshot(fallbackHost);
-      logicalChildNodes.forEach(function(node) {
-        this.appendChild(visualParent, node);
-      }, this);
-    },
-
-    // http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#dfn-tree-composition
-    treeComposition: function () {
-      var shadowHost = this.host;
-      var tree = shadowHost.shadowRoot;  // 1.
-      var pool = [];  // 2.
-      var shadowHostChildNodes = getChildNodesSnapshot(shadowHost);
-      shadowHostChildNodes.forEach(function(child) {  // 3.
-        if (isInsertionPoint(child)) {  // 3.2.
-          var reprojected = getDistributedChildNodes(child);  // 3.2.1.
-          // if reprojected is undef... reset it?
-          if (!reprojected || !reprojected.length)  // 3.2.2.
-            reprojected = getChildNodesSnapshot(child);
-          pool.push.apply(pool, reprojected);  // 3.2.3.
-        } else {
-          pool.push(child); // 3.3.
-        }
-      });
-
-      var shadowInsertionPoint, point;
-      while (tree) {  // 4.
-        // 4.1.
-        shadowInsertionPoint = undefined;  // Reset every iteration.
-        visit(tree, isActiveShadowInsertionPoint, function(point) {
-          shadowInsertionPoint = point;
-          return false;
-        });
-        point = shadowInsertionPoint;
-
-        pool = distribute(tree, pool);  // 4.2.
-        if (point) {  // 4.3.
-          var nextOlderTree = getNextOlderTree(tree);  // 4.3.1.
-          if (!nextOlderTree) {
-            break;  // 4.3.1.1.
-          } else {
-            tree = nextOlderTree;  // 4.3.2.2.
-            assignShadowTreeToShadowInsertionPoint(tree, point);  // 4.3.2.2.
-            continue;  // 4.3.2.3.
-          }
-        } else {
-          break;  // 4.4.
-        }
-      }
-    },
-
-    // Visual DOM mutation.
-    appendChild: function(parent, child) {
-      appendChild(parent, child);
-      this.associateNode(child);
-    },
-
-    remove: function(node) {
-      remove(node);
-      this.associateNode(node);
-    },
-
-    removeAllChildNodes: function(parent) {
-      removeAllChildNodes(parent);
-      // TODO(arv): Does this need to associate all the nodes with this renderer?
-    },
-
-    associateNode: function(node) {
-      // TODO: Clear when moved out of shadow tree.
-      shadowDOMRendererTable.set(node, this);
-    }
-  };
-
-  function isInsertionPoint(node) {
-    // Should this include <shadow>?
-    return node.localName === 'content';
-  }
-
-  function isActiveInsertionPoint(node) {
-    // <content> inside another <content> or <shadow> is considered inactive.
-    return node.localName === 'content';
-  }
-
-  function isShadowInsertionPoint(node) {
-    return node.localName === 'shadow';
-  }
-
-  function isActiveShadowInsertionPoint(node) {
-    // <shadow> inside another <content> or <shadow> is considered inactive.
-    return node.localName === 'shadow';
-  }
-
-  function isShadowHost(shadowHost) {
-    return !!shadowHost.shadowRoot;
-  }
-
-  /**
-   * @param {WrapperShadowRoot} tree
-   */
-  function getNextOlderTree(tree) {
-    return nextOlderShadowTreeTable.get(tree);
-  }
-
-  function getShadowTrees(host) {
-    var trees = [];
-
-    for (var tree = host.shadowRoot;
-         tree;
-         tree = nextOlderShadowTreeTable.get(tree)) {
-      trees.push(tree);
-    }
-    return trees;
-  }
-
-  function assignShadowTreeToShadowInsertionPoint(tree, point) {
-    insertionParentTable.set(tree, point);
-  }
-
-  // http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#rendering-shadow-trees
-  function render(host) {
-    new ShadowRenderer(host).render();
-  };
-
-  Node.prototype.invalidateShadowRenderer = function(force) {
-    // TODO: If this is in light DOM we only need to invalidate renderer if this
-    // is a direct child of a ShadowRoot.
-    // Maybe we should only associate renderers with direct child nodes of a
-    // shadow root (and all nodes in the shadow dom).
-    var renderer = shadowDOMRendererTable.get(this);
-    if (!renderer)
-      return false;
-
-    var p;
-    if (force || this.shadowRoot ||
-        (p = this.parentNode) && (p.shadowRoot || p instanceof ShadowRoot)) {
-      renderer.invalidate();
-    }
-
-    return true;
-  };
-
-  HTMLContentElement.prototype.getDistributedNodes = function() {
-    // TODO(arv): We should associate the element with the shadow root so we
-    // only have to rerender this ShadowRenderer.
-    renderAllPending();
-    return getDistributedChildNodes(this);
-  };
-
-  mixin(Node.prototype, {
-    get insertionParent() {
-      return insertionParentTable.get(this) || null;
-    }
-  });
-
-  scope.eventParentsTable = eventParentsTable;
-  scope.getRendererForHost = getRendererForHost;
-  scope.getShadowTrees = getShadowTrees;
-  scope.nextOlderShadowTreeTable = nextOlderShadowTreeTable;
-  scope.renderAllPending = renderAllPending;
-
-  // Exposed for testing
-  scope.visual = {
-    removeAllChildNodes: removeAllChildNodes,
-    appendChild: appendChild,
-    removeChild: removeChild
-  };
-
-})(this.ShadowDOMPolyfill);
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var GetElementsByInterface = scope.GetElementsByInterface;
-  var Node = scope.wrappers.Node;
-  var ParentNodeInterface = scope.ParentNodeInterface;
-  var SelectorsInterface = scope.SelectorsInterface;
-  var defineWrapGetter = scope.defineWrapGetter;
-  var elementFromPoint = scope.elementFromPoint;
-  var forwardMethodsToWrapper = scope.forwardMethodsToWrapper;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var unwrap = scope.unwrap;
-  var wrap = scope.wrap;
-  var wrapEventTargetMethods = scope.wrapEventTargetMethods;
-  var wrapNodeList = scope.wrapNodeList;
-
-  var implementationTable = new SideTable();
-
-  function Document(node) {
-    Node.call(this, node);
-  }
-  Document.prototype = Object.create(Node.prototype);
-
-  defineWrapGetter(Document, 'documentElement');
-
-  // Conceptually both body and head can be in a shadow but suporting that seems
-  // overkill at this point.
-  defineWrapGetter(Document, 'body');
-  defineWrapGetter(Document, 'head');
-
-  // document cannot be overridden so we override a bunch of its methods
-  // directly on the instance.
-
-  function wrapMethod(name) {
-    var original = document[name];
-    Document.prototype[name] = function() {
-      return wrap(original.apply(this.impl, arguments));
-    };
-  }
-
-  [
-    'getElementById',
-    'createElement',
-    'createElementNS',
-    'createTextNode',
-    'createDocumentFragment',
-    'createEvent',
-    'createEventNS',
-  ].forEach(wrapMethod);
-
-  var originalAdoptNode = document.adoptNode;
-  var originalWrite = document.write;
-
-  mixin(Document.prototype, {
-    adoptNode: function(node) {
-      originalAdoptNode.call(this.impl, unwrap(node));
-      return node;
-    },
-    elementFromPoint: function(x, y) {
-      return elementFromPoint(this, this, x, y);
-    },
-    write: function(s) {
-      var all = this.querySelectorAll('*');
-      var last = all[all.length - 1];
-      while (last.nextSibling) {
-        last = last.nextSibling;
-      }
-      var p = last.parentNode;
-      p.lastChild_ = undefined;
-      last.nextSibling_ = undefined;
-      originalWrite.call(this.impl, s);
-    }
-  });
-
-  // We also override some of the methods on document.body and document.head
-  // for convenience.
-  forwardMethodsToWrapper([
-    window.HTMLBodyElement,
-    window.HTMLDocument || window.Document,  // Gecko adds these to HTMLDocument
-    window.HTMLHeadElement,
-  ], [
-    'appendChild',
-    'compareDocumentPosition',
-    'getElementsByClassName',
-    'getElementsByTagName',
-    'getElementsByTagNameNS',
-    'insertBefore',
-    'querySelector',
-    'querySelectorAll',
-    'removeChild',
-    'replaceChild',
-  ]);
-
-  forwardMethodsToWrapper([
-    window.HTMLDocument || window.Document,  // Gecko adds these to HTMLDocument
-  ], [
-    'adoptNode',
-    'createDocumentFragment',
-    'createElement',
-    'createElementNS',
-    'createEvent',
-    'createEventNS',
-    'createTextNode',
-    'elementFromPoint',
-    'getElementById',
-    'write',
-  ]);
-
-  mixin(Document.prototype, GetElementsByInterface);
-  mixin(Document.prototype, ParentNodeInterface);
-  mixin(Document.prototype, SelectorsInterface);
-
-  mixin(Document.prototype, {
-    get implementation() {
-      var implementation = implementationTable.get(this);
-      if (implementation)
-        return implementation;
-      implementation =
-          new DOMImplementation(unwrap(this).implementation);
-      implementationTable.set(this, implementation);
-      return implementation;
-    }
-  });
-
-  registerWrapper(window.Document, Document,
-      document.implementation.createHTMLDocument(''));
-
-  // Both WebKit and Gecko uses HTMLDocument for document. HTML5/DOM only has
-  // one Document interface and IE implements the standard correctly.
-  if (window.HTMLDocument)
-    registerWrapper(window.HTMLDocument, Document);
-
-  wrapEventTargetMethods([
-    window.HTMLBodyElement,
-    window.HTMLDocument || window.Document,  // Gecko adds these to HTMLDocument
-    window.HTMLHeadElement,
-  ]);
-
-  function DOMImplementation(impl) {
-    this.impl = impl;
-  }
-
-  function wrapImplMethod(constructor, name) {
-    var original = document.implementation[name];
-    constructor.prototype[name] = function() {
-      return wrap(original.apply(this.impl, arguments));
-    };
-  }
-
-  function forwardImplMethod(constructor, name) {
-    var original = document.implementation[name];
-    constructor.prototype[name] = function() {
-      return original.apply(this.impl, arguments);
-    };
-  }
-
-  wrapImplMethod(DOMImplementation, 'createDocumentType');
-  wrapImplMethod(DOMImplementation, 'createDocument');
-  wrapImplMethod(DOMImplementation, 'createHTMLDocument');
-  forwardImplMethod(DOMImplementation, 'hasFeature');
-
-  registerWrapper(window.DOMImplementation, DOMImplementation);
-
-  forwardMethodsToWrapper([
-    window.DOMImplementation,
-  ], [
-    'createDocumentType',
-    'createDocument',
-    'createHTMLDocument',
-    'hasFeature',
-  ]);
-
-  scope.wrappers.Document = Document;
-  scope.wrappers.DOMImplementation = DOMImplementation;
-
-})(this.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var EventTarget = scope.wrappers.EventTarget;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var unwrap = scope.unwrap;
-  var unwrapIfNeeded = scope.unwrapIfNeeded;
-  var wrap = scope.wrap;
-
-  var OriginalWindow = window.Window;
-
-  function Window(impl) {
-    EventTarget.call(this, impl);
-  }
-  Window.prototype = Object.create(EventTarget.prototype);
-
-  var originalGetComputedStyle = window.getComputedStyle;
-  OriginalWindow.prototype.getComputedStyle = function(el, pseudo) {
-    return originalGetComputedStyle.call(this || window, unwrapIfNeeded(el),
-                                         pseudo);
-  };
-
-  ['addEventListener', 'removeEventListener', 'dispatchEvent'].forEach(
-      function(name) {
-        OriginalWindow.prototype[name] = function() {
-          var w = wrap(this || window);
-          return w[name].apply(w, arguments);
-        };
-      });
-
-  mixin(Window.prototype, {
-    getComputedStyle: function(el, pseudo) {
-      return originalGetComputedStyle.call(unwrap(this), unwrapIfNeeded(el),
-                                           pseudo);
-    }
-  });
-
-  registerWrapper(OriginalWindow, Window);
-
-  scope.wrappers.Window = Window;
-
-})(this.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var defineGetter = scope.defineGetter;
-  var defineWrapGetter = scope.defineWrapGetter;
-  var registerWrapper = scope.registerWrapper;
-  var unwrapIfNeeded = scope.unwrapIfNeeded;
-  var wrapNodeList = scope.wrapNodeList;
-  var wrappers = scope.wrappers;
-
-  var OriginalMutationObserver = window.MutationObserver ||
-      window.WebKitMutationObserver;
-
-  if (!OriginalMutationObserver)
-    return;
-
-  var OriginalMutationRecord = window.MutationRecord;
-
-  function MutationRecord(impl) {
-    this.impl = impl;
-  }
-
-  MutationRecord.prototype = {
-    get addedNodes() {
-      return wrapNodeList(this.impl.addedNodes);
-    },
-    get removedNodes() {
-      return wrapNodeList(this.impl.removedNodes);
-    }
-  };
-
-  ['target', 'previousSibling', 'nextSibling'].forEach(function(name) {
-    defineWrapGetter(MutationRecord, name);
-  });
-
-  // WebKit/Blink treats these as instance properties so we override
-  [
-    'type',
-    'attributeName',
-    'attributeNamespace',
-    'oldValue'
-  ].forEach(function(name) {
-    defineGetter(MutationRecord, name, function() {
-      return this.impl[name];
-    });
-  });
-
-  if (OriginalMutationRecord)
-    registerWrapper(OriginalMutationRecord, MutationRecord);
-
-  function wrapRecord(record) {
-    return new MutationRecord(record);
-  }
-
-  function wrapRecords(records) {
-    return records.map(wrapRecord);
-  }
-
-  function MutationObserver(callback) {
-    var self = this;
-    this.impl = new OriginalMutationObserver(function(mutations, observer) {
-      callback.call(self, wrapRecords(mutations), self);
-    });
-  }
-
-  var OriginalNode = window.Node;
-
-  MutationObserver.prototype = {
-    observe: function(target, options) {
-      this.impl.observe(unwrapIfNeeded(target), options);
-    },
-    disconnect: function() {
-      this.impl.disconnect();
-    },
-    takeRecords: function() {
-      return wrapRecords(this.impl.takeRecords());
-    }
-  };
-
-  scope.wrappers.MutationObserver = MutationObserver;
-  scope.wrappers.MutationRecord = MutationRecord;
-
-})(this.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var isWrapperFor = scope.isWrapperFor;
-
-  // This is a list of the elements we currently override the global constructor
-  // for.
-  var elements = {
-    'a': 'HTMLAnchorElement',
-    'applet': 'HTMLAppletElement',
-    'area': 'HTMLAreaElement',
-    'audio': 'HTMLAudioElement',
-    'br': 'HTMLBRElement',
-    'base': 'HTMLBaseElement',
-    'body': 'HTMLBodyElement',
-    'button': 'HTMLButtonElement',
-    'canvas': 'HTMLCanvasElement',
-    // 'command': 'HTMLCommandElement',  // Not fully implemented in Gecko.
-    'dl': 'HTMLDListElement',
-    'datalist': 'HTMLDataListElement',
-    'dir': 'HTMLDirectoryElement',
-    'div': 'HTMLDivElement',
-    'embed': 'HTMLEmbedElement',
-    'fieldset': 'HTMLFieldSetElement',
-    'font': 'HTMLFontElement',
-    'form': 'HTMLFormElement',
-    'frame': 'HTMLFrameElement',
-    'frameset': 'HTMLFrameSetElement',
-    'hr': 'HTMLHRElement',
-    'head': 'HTMLHeadElement',
-    'h1': 'HTMLHeadingElement',
-    'html': 'HTMLHtmlElement',
-    'iframe': 'HTMLIFrameElement',
-
-    // Uses HTMLSpanElement in Firefox.
-    // https://bugzilla.mozilla.org/show_bug.cgi?id=843881
-    // 'image',
-
-    'input': 'HTMLInputElement',
-    'li': 'HTMLLIElement',
-    'label': 'HTMLLabelElement',
-    'legend': 'HTMLLegendElement',
-    'link': 'HTMLLinkElement',
-    'map': 'HTMLMapElement',
-    // 'media', Covered by audio and video
-    'menu': 'HTMLMenuElement',
-    'menuitem': 'HTMLMenuItemElement',
-    'meta': 'HTMLMetaElement',
-    'meter': 'HTMLMeterElement',
-    'del': 'HTMLModElement',
-    'ol': 'HTMLOListElement',
-    'object': 'HTMLObjectElement',
-    'optgroup': 'HTMLOptGroupElement',
-    'option': 'HTMLOptionElement',
-    'output': 'HTMLOutputElement',
-    'p': 'HTMLParagraphElement',
-    'param': 'HTMLParamElement',
-    'pre': 'HTMLPreElement',
-    'progress': 'HTMLProgressElement',
-    'q': 'HTMLQuoteElement',
-    'script': 'HTMLScriptElement',
-    'select': 'HTMLSelectElement',
-    'source': 'HTMLSourceElement',
-    'span': 'HTMLSpanElement',
-    'style': 'HTMLStyleElement',
-    'caption': 'HTMLTableCaptionElement',
-    // WebKit and Moz are wrong:
-    // https://bugs.webkit.org/show_bug.cgi?id=111469
-    // https://bugzilla.mozilla.org/show_bug.cgi?id=848096
-    // 'td': 'HTMLTableCellElement',
-    'col': 'HTMLTableColElement',
-    'table': 'HTMLTableElement',
-    'tr': 'HTMLTableRowElement',
-    'thead': 'HTMLTableSectionElement',
-    'tbody': 'HTMLTableSectionElement',
-    'textarea': 'HTMLTextAreaElement',
-    'title': 'HTMLTitleElement',
-    'ul': 'HTMLUListElement',
-    'video': 'HTMLVideoElement',
-  };
-
-  function overrideConstructor(tagName) {
-    var nativeConstructorName = elements[tagName];
-    var nativeConstructor = window[nativeConstructorName];
-    if (!nativeConstructor)
-      return;
-    var element = document.createElement(tagName);
-    var wrapperConstructor = element.constructor;
-    window[nativeConstructorName] = wrapperConstructor;
-  }
-
-  Object.keys(elements).forEach(overrideConstructor);
-
-  Object.getOwnPropertyNames(scope.wrappers).forEach(function(name) {
-    window[name] = scope.wrappers[name]
-  });
-
-  // Export for testing.
-  scope.knownElements = elements;
-
-})(this.ShadowDOMPolyfill);
-/*
- * Copyright 2013 The Polymer Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-(function() {
-  var ShadowDOMPolyfill = window.ShadowDOMPolyfill;
-  var wrap = ShadowDOMPolyfill.wrap;
-
-  // patch in prefixed name
-  Object.defineProperties(HTMLElement.prototype, {
-    //TODO(sjmiles): review accessor alias with Arv
-    webkitShadowRoot: {
-      get: function() {
-        return this.shadowRoot;
-      }
-    }
-  });
-
-  //TODO(sjmiles): review method alias with Arv
-  HTMLElement.prototype.webkitCreateShadowRoot =
-      HTMLElement.prototype.createShadowRoot;
-
-  // TODO(jmesserly): figure out what to do about these Dart-specific patches
-  // Right now it depends on some dart2js impl details to patch getTypeNameOf
-  // TODO(jmesserly): we need to wrap document somehow (a dart:html hook?)
-  window.dartMainRunner = function(main) {
-    var NodeList = ShadowDOMPolyfill.wrappers.NodeList;
-    var ShadowRoot = ShadowDOMPolyfill.wrappers.ShadowRoot;
-    var isWrapper = ShadowDOMPolyfill.isWrapper;
-    var unwrap = ShadowDOMPolyfill.unwrap;
-    var innerTypeNameOf = window.$.getFunctionForTypeNameOf();
-
-    function typeNameOfShadowDOM(obj) {
-      var result;
-      if (obj instanceof NodeList) {
-        result = 'NodeList';
-      } else if (obj instanceof ShadowRoot) {
-        result = 'ShadowRoot';
-      } else if (obj instanceof MutationRecord) {
-        result = 'MutationRecord';
-      } else if (obj instanceof MutationObserver) {
-        result = 'MutationObserver';
-      } else {
-        if (isWrapper(obj)) {
-          obj = unwrap(obj);
-
-          // Fix up class names for Firefox. For some of them like
-          // HTMLFormElement and HTMLInputElement, the "constructor" property of
-          // the unwrapped nodes points at the wrapper for some reason.
-          // TODO(jmesserly): figure out why this is happening.
-          var ctor = obj.constructor;
-          if (ctor && !ctor.builtin$cls && ctor.name == 'GeneratedWrapper') {
-            var name = Object.prototype.toString.call(obj);
-            name = name.substring(8, name.length - 1);
-            ctor.builtin$cls = name;
-          }
-        }
-
-        result = innerTypeNameOf.call$1(obj);
-      }
-
-      return result;
-    }
-
-    function constructorNameShadowDOM(object) {
-      var $constructor, $name, string;
-      if (object == null)
-        return "Null";
-      $constructor = object.constructor;
-      if (typeof $constructor === "function") {
-        $name = $constructor.builtin$cls;
-        if ($name != null)
-          return $name;
-      }
-
-    }
-
-    window.$.constructorNameFallback = constructorNameShadowDOM;
-    window.$._getTypeNameOf = { call$1: typeNameOfShadowDOM };
-    window.Isolate.$isolateProperties._getTypeNameOf = window.$._getTypeNameOf;
-
-    // Invoke the real main
-    main();
-  };
-
-})();
-
-}