Web Animations CSS: Unfreeze AnimationClock if sampling timelines does not trigger style recalc

Source/core/animation/Player.h

 /*
  * 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 31 matching lines @@
 
 public:
     ~Player();
     static PassRefPtr<Player> create(DocumentTimeline&, TimedItem*);
 
     // Returns whether this player is still current or in effect.
     // timeToEffectChange returns:
     //  infinity  - if this player is no longer in effect
     //  0         - if this player requires an update on the next frame
     //  n         - if this player requires an update after 'n' units of time
-    bool update(double* timeToEffectChange = 0);
+    bool update(double* timeToEffectChange = 0, bool* didTriggerStyleRecalc = 0);
 
     void cancel();
     double currentTime() const;
     void setCurrentTime(double);
     bool paused() const { return !m_isPausedForTesting && pausedInternal(); }
     void setPaused(bool);
     double playbackRate() const { return m_playbackRate; }
     void setPlaybackRate(double);
     double startTime() const { return m_startTime; }
     double timeDrift() const;
@@ skipping 19 matching lines @@
     const double m_startTime;
 
     RefPtr<TimedItem> m_content;
     DocumentTimeline& m_timeline;
     bool m_isPausedForTesting;
 };
 
 } // namespace
 
 #endif