Web Animations: Don't eagerly assign start times for element.animate

Source/core/animation/AnimationTimeline.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 65 matching lines @@
     m_players.add(result);
     setOutdatedAnimationPlayer(result);
     return result;
 }
 
 AnimationPlayer* AnimationTimeline::play(AnimationNode* child)
 {
     if (!m_document)
         return 0;
     AnimationPlayer* player = createAnimationPlayer(child);
-    player->setStartTimeInternal(effectiveTime());
     m_document->compositorPendingAnimations().add(player);
     return player;
 }
 
 void AnimationTimeline::wake()
 {
     m_timing->serviceOnNextFrame();
 }
 
 void AnimationTimeline::serviceAnimations(TimingUpdateReason reason)
@@ skipping 127 matching lines @@
 
 void AnimationTimeline::trace(Visitor* visitor)
 {
     visitor->trace(m_document);
     visitor->trace(m_timing);
     visitor->trace(m_playersNeedingUpdate);
     visitor->trace(m_players);
 }
 
 } // namespace