Migrate the samples to one-argument version of requestAnimationFrame and re-enable the test.

samples/ui_lib/base/AnimationScheduler.dart

 // Copyright (c) 2011, 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.
 
 typedef void AnimationCallback(num currentTime);
 
 class CallbackData {
   final AnimationCallback callback;
   final num minTime;
   int id;
@@ skipping 79 matching lines @@
   void _setupInterval() {
     // Assert that we never schedule multiple frames at once.
     assert(_intervalId === null);
     if (USE_INTERVALS) {
       _intervalId = window.setInterval(_step, MS_PER_FRAME);
     } else {
       if (_webkitAnimationFrameMaybeAvailable) {
         try {
           // TODO(jacobr): passing in document should not be required.
           _intervalId = window.webkitRequestAnimationFrame(
-              (int ignored) { _step(); }, document);
+              (int ignored) { _step(); });
               // TODO(jacobr) fix this odd type error.
         } catch (var e) {
           _webkitAnimationFrameMaybeAvailable = false;
         }
       }
       if (!_webkitAnimationFrameMaybeAvailable) {
         _intervalId = window.setTimeout(() { _step(); }, MS_PER_FRAME);
       }
     }
   }
@@ skipping 46 matching lines @@
     _frameCount++;
     if (_isMobileSafari) {
       // Hack to work around an iOS bug where sometimes animations do not
       // render if only webkit transforms were modified.
       // TODO(jacobr): find a cleaner workaround.
       int offset = _frameCount % 2;
       _safariHackStyle.left = '${offset}px';
     }
   }
 }