Add dummy dart:html library for documentation.

lib/html/doc/interface/Event.dartdoc

Index: lib/html/doc/interface/Event.dartdoc
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+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// WARNING:
+//   This file contains documentation that is merged into the real source.
+//   Do not make code changes here.
+
+/// @domName Event
+interface Event default _EventFactoryProvider {
+
+  // In JS, canBubble and cancelable are technically required parameters to
+  // init*Event. In practice, though, if they aren't provided they simply
+  // default to false (since that's Boolean(undefined)).
+  //
+  // Contrary to JS, we default canBubble and cancelable to true, since that's
+  // what people want most of the time anyway.
+  Event(String type, [bool canBubble, bool cancelable]);
+
+  static final int AT_TARGET = 2;
+
+  static final int BLUR = 8192;
+
+  static final int BUBBLING_PHASE = 3;
+
+  static final int CAPTURING_PHASE = 1;
+
+  static final int CHANGE = 32768;
+
+  static final int CLICK = 64;
+
+  static final int DBLCLICK = 128;
+
+  static final int DRAGDROP = 2048;
+
+  static final int FOCUS = 4096;
+
+  static final int KEYDOWN = 256;
+
+  static final int KEYPRESS = 1024;
+
+  static final int KEYUP = 512;
+
+  static final int MOUSEDOWN = 1;
+
+  static final int MOUSEDRAG = 32;
+
+  static final int MOUSEMOVE = 16;
+
+  static final int MOUSEOUT = 8;
+
+  static final int MOUSEOVER = 4;
+
+  static final int MOUSEUP = 2;
+
+  static final int NONE = 0;
+
+  static final int SELECT = 16384;
+
+  /** @domName Event.bubbles */
+  final bool bubbles;
+
+  /** @domName Event.cancelBubble */
+  bool cancelBubble;
+
+  /** @domName Event.cancelable */
+  final bool cancelable;
+
+  /** @domName Event.clipboardData */
+  final Clipboard clipboardData;
+
+  /** @domName Event.currentTarget */
+  final EventTarget currentTarget;
+
+  /** @domName Event.defaultPrevented */
+  final bool defaultPrevented;
+
+  /** @domName Event.eventPhase */
+  final int eventPhase;
+
+  /** @domName Event.returnValue */
+  bool returnValue;
+
+  /** @domName Event.srcElement */
+  final EventTarget srcElement;
+
+  /** @domName Event.target */
+  final EventTarget target;
+
+  /** @domName Event.timeStamp */
+  final int timeStamp;
+
+  /** @domName Event.type */
+  final String type;
+
+  /** @domName Event.initEvent */
+  void $dom_initEvent(String eventTypeArg, bool canBubbleArg, bool cancelableArg);
+
+  /** @domName Event.preventDefault */
+  void preventDefault();
+
+  /** @domName Event.stopImmediatePropagation */
+  void stopImmediatePropagation();
+
+  /** @domName Event.stopPropagation */
+  void stopPropagation();
+}