Make isUtc a getter, change some method names in Date.

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 105 matching lines @@
       assert(_intervalId != null);
       if (USE_INTERVALS) {
         window.clearInterval(_intervalId);
       }
       _intervalId = null;
     } else if (USE_INTERVALS == false) {
       _intervalId = null;
       _setupInterval();
     }
     int numRemaining = 0;
-    int minTime = new Date.now().value + MS_PER_FRAME;
+    int minTime = new Date.now().millisecondsSinceEpoch + MS_PER_FRAME;
 
     int len = _callbacks.length;
     for (final callback in _callbacks) {
       if (!callback.ready(minTime)) {
         numRemaining++;
       }
     }
 
     if (numRemaining == len) {
       // TODO(jacobr): we could be more clever about this case if delayed
@@ skipping 20 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';
     }
   }
 }