Animations: Introduce compositor AnimationPlayer and AnimationTimeline.

public/platform/WebLayerTreeView.h

 /*
  * Copyright (C) 2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
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 #include "WebNonCopyable.h"
 #include "WebPrivateOwnPtr.h"
 #include "WebSize.h"
 #include "WebTopControlsState.h"
 
 class SkBitmap;
 
 namespace blink {
 
 class WebCompositeAndReadbackAsyncCallback;
+class WebCompositorAnimationTimeline;
 class WebLayer;
 struct WebPoint;
 struct WebSelectionBound;
 class WebWidget;
 
 class WebLayerTreeView {
 public:
     virtual ~WebLayerTreeView() { }
 
     // Initialization and lifecycle --------------------------------------
 
     // Sets the root of the tree. The root is set by way of the constructor.
     virtual void setRootLayer(const WebLayer&) = 0;
     virtual void clearRootLayer() = 0;
 
+    virtual void attachCompositorAnimationTimeline(WebCompositorAnimationTimeline*) { }
+    virtual void detachCompositorAnimationTimeline(WebCompositorAnimationTimeline*) { }
 
     // View properties ---------------------------------------------------
 
     virtual void setViewportSize(const WebSize& deviceViewportSize) = 0;
     // Gives the viewport size in physical device pixels.
     virtual WebSize deviceViewportSize() const = 0;
 
     virtual void setDeviceScaleFactor(float) = 0;
     virtual float deviceScaleFactor() const = 0;
 
@@ skipping 83 matching lines @@
     // Toggles continuous painting
     virtual void setContinuousPaintingEnabled(bool) { }
 
     // Toggles scroll bottleneck rects on the HUD layer
     virtual void setShowScrollBottleneckRects(bool) { }
 };
 
 } // namespace blink
 
 #endif // WebLayerTreeView_h