Make List.shuffle take an optional Random object to use.

tools/dom/templates/html/impl/impl_Node.darttemplate

 // 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.
 
 part of $LIBRARYNAME;
 
 /**
  * Lazy implementation of the child nodes of an element that does not request
  * the actual child nodes of an element until strictly necessary greatly
  * improving performance for the typical cases where it is not required.
@@ skipping 137 matching lines @@
   Iterator<Node> get iterator => _this.childNodes.iterator;
 
   // From List<Node>:
 
   // TODO(jacobr): this could be implemented for child node lists.
   // The exception we throw here is misleading.
   void sort([Comparator<Node> compare]) {
     throw new UnsupportedError("Cannot sort Node list");
   }
 
-  void shuffle() {
+  void shuffle([Random random]) {
     throw new UnsupportedError("Cannot shuffle Node list");
   }
 
   // FIXME: implement these.
   void setRange(int start, int end, Iterable<Node> iterable,
                 [int skipCount = 0]) {
     throw new UnsupportedError("Cannot setRange on Node list");
   }
 
   void fillRange(int start, int end, [Node fill]) {
@@ skipping 151 matching lines @@
   Map<String, dynamic> get bindings =>
       TemplateElement.mdvPackage(this).bindings;
 
   /** Gets the template instance that instantiated this node, if any. */
   @Experimental()
   TemplateInstance get templateInstance =>
       TemplateElement.mdvPackage(this).templateInstance;
 
 $!MEMBERS
 }