Changing return value of request animation frame.

lib/html/templates/html/dart2js/impl_Window.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.
 
 class $CLASSNAME$EXTENDS$IMPLEMENTS native "@*DOMWindow" {
 
   _DocumentImpl get document() native "return this.document;";
 
   Window get _top() native "return this.top;";
 
@@ skipping 89 matching lines @@
    if (this.requestAnimationFrame && this.cancelAnimationFrame) return;
    var vendors = ['ms', 'moz', 'webkit', 'o'];
    for (var i = 0; i < vendors.length && !this.requestAnimationFrame; ++i) {
      this.requestAnimationFrame = this[vendors[i] + 'RequestAnimationFrame'];
      this.cancelAnimationFrame =
          this[vendors[i]+'CancelAnimationFrame'] ||
          this[vendors[i]+'CancelRequestAnimationFrame'];
    }
    if (this.requestAnimationFrame && this.cancelAnimationFrame) return;
    this.requestAnimationFrame = function(callback) {
-       return window.setTimeout(callback, 16 /* 16ms ~= 60fps */);
+      return window.setTimeout(function() {
+        callback(Date.now());
+      }, 16 /* 16ms ~= 60fps */);
    };
    this.cancelAnimationFrame = function(id) { clearTimeout(id); }
 ''';
 
 
   _IDBFactoryImpl get indexedDB => _get_indexedDB();
 
   _IDBFactoryImpl _get_indexedDB() native
       'return this.indexedDB || this.webkitIndexedDB || this.mozIndexedDB';
 
@@ skipping 10 matching lines @@
 
   String createObjectUrl(object) native '''
     return (window.URL || window.webkitURL).createObjectURL(object)
   ''';
 
   void revokeObjectUrl(String objectUrl) native '''
     (window.URL || window.webkitURL).revokeObjectURL(objectUrl)
   ''';
 $!MEMBERS
 }