Web Animations CSS: Start running animations on the compositor

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 57 matching lines @@
     void setStartTime(double);
 
     TimedItem* source() { return m_content.get(); }
 
     // Pausing via this method is not reflected in the value returned by
     // paused() and must never overlap with pausing via setPaused().
     void pauseForTesting();
     // Reflects all pausing, including via pauseForTesting().
     bool pausedInternal() const { return !isNull(m_pauseStartTime); }
 
+    bool maybeStartAnimationOnCompositor();
+    void cancelAnimationOnCompositor();
+
 private:
     Player(DocumentTimeline&, TimedItem*);
     inline double pausedTimeDrift() const;
     inline double currentTimeBeforeDrift() const;
 
+    bool hasActiveAnimationsOnCompositor();
+
     void setPausedImpl(bool);
 
     double m_pauseStartTime;
     double m_playbackRate;
     double m_timeDrift;
     double m_startTime;
 
     RefPtr<TimedItem> m_content;
     DocumentTimeline& m_timeline;
     bool m_isPausedForTesting;
 };
 
 } // namespace
 
 #endif