Port DocumentFragment to the new wrapperless DOM.

client/html/src/shared_FactoryProviders.dart

 // 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.
 
 class _TextFactoryProvider {
 
   factory Text(String data) => _document._createTextNode(data);
 }
 
 class _EventFactoryProvider {
@@ skipping 14 matching lines @@
     final e = _document._createEvent("MouseEvent");
     e._initMouseEvent(type, canBubble, cancelable, view, detail,
         screenX, screenY, clientX, clientY, ctrlKey, altKey, shiftKey, metaKey,
         button, relatedTarget);
     return e;
   }
 }
 
 class _CSSStyleDeclarationFactoryProvider {
   factory CSSStyleDeclaration.css(String css) {
-    var style = new Element.tag('div').style;
+    final style = new Element.tag('div').style;
     style.cssText = css;
     return style;
   } 
 
   factory CSSStyleDeclaration() {
     return new CSSStyleDeclaration.css('');
   }
 }
 
 final _START_TAG_REGEXP = const RegExp('<(\\w+)');
@@ skipping 44 matching lines @@
       throw new IllegalArgumentException('HTML had ${temp.elements.length} ' +
           'top level elements but 1 expected');
     }
     element.remove();
     return element;
   }
 
   /** @domName Document.createElement */
   factory Element.tag(String tag) => _document._createElement(tag);
 }
+
+class _DocumentFragmentFactoryProvider {
+  /** @domName Document.createDocumentFragment */
+  factory DocumentFragment() => document.createDocumentFragment();
+
+  factory DocumentFragment.html(String html) {
+    final fragment = new DocumentFragment();
+    fragment.innerHTML = html;
+    return fragment;
+  }
+
+  // TODO(nweiz): enable this when XML is ported.
+  // factory DocumentFragment.xml(String xml) {
+  //   final fragment = new DocumentFragment();
+  //   final e = new XMLElement.tag("xml");
+  //   e.innerHTML = xml;
+  //
+  //   // Copy list first since we don't want liveness during iteration.
+  //   final List nodes = new List.from(e.nodes);
+  //   fragment.nodes.addAll(nodes);
+  //   return fragment;
+  // }
+
+  // TODO(nweiz): enable this when SVG is ported.
+  // factory DocumentFragment.svg(String svg) {
+  //   final fragment = new DocumentFragment();
+  //   final e = new SVGSVGElement();
+  //   e.innerHTML = svg;
+  //
+  //   // Copy list first since we don't want liveness during iteration.
+  //   final List nodes = new List.from(e.nodes);
+  //   fragment.nodes.addAll(nodes);
+  //   return fragment;
+  // }
+}