Add List.shuffle().

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 02d902ea3ba8e75cc9d0ea7719b99c74edd458f4..c39d0af1572731db90370d301e41fc8ae5925e3b 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -7170,7 +7170,6 @@ class Document extends Node  native "Document"
   DocumentFragment createDocumentFragment() native;
 
   @JSName('createElement')
-  /// Deprecated: use new Element.tag(tagName) instead.
   @DomName('Document.createElement')
   @DocsEditable()
   Element _createElement(String localName_OR_tagName, [String typeExtension]) native;
@@ -8072,6 +8071,10 @@ class _ChildrenElementList extends ListBase<Element> {
     throw new UnsupportedError('Cannot sort element lists');
   }
 
+  void shuffle() {
+    throw new UnsupportedError('Cannot shuffle element lists');
+  }
+
   void removeWhere(bool test(Element element)) {
     _filter(test, false);
   }
@@ -8517,6 +8520,10 @@ class _FrozenElementList<T extends Element> extends ListBase<T> implements Eleme
     throw new UnsupportedError('Cannot sort list');
   }
 
+  void shuffle() {
+    throw new UnsupportedError('Cannot shuffle list');
+  }
+
   Element get first => _nodeList.first;
 
   Element get last => _nodeList.last;
@@ -17662,6 +17669,10 @@ class _ChildNodeListLazy extends ListBase<Node> {
     throw new UnsupportedError("Cannot sort Node list");
   }
 
+  void shuffle() {
+    throw new UnsupportedError("Cannot shuffle Node list");
+  }
+
   // FIXME: implement these.
   void setRange(int start, int end, Iterable<Node> iterable,
                 [int skipCount = 0]) {
@@ -29295,6 +29306,10 @@ abstract class ImmutableListMixin<E> implements List<E> {
     throw new UnsupportedError("Cannot sort immutable List.");
   }
 
+  void shuffle() {
+    throw new UnsupportedError("Cannot shuffle immutable List.");
+  }
+
   void insert(int index, E element) {
     throw new UnsupportedError("Cannot add to immutable List.");
   }