Blink Compositor Animation: Introduce CompositorAnimationHost correctly.

third_party/WebKit/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 "WebBrowserControlsState.h"
 #include "WebColor.h"
 #include "WebCommon.h"
 #include "WebCompositorMutatorClient.h"
 #include "WebEventListenerProperties.h"
 #include "WebFloatPoint.h"
 #include "WebSize.h"
 
 namespace cc {
-class AnimationTimeline;
+class AnimationHost;
 }
 
 namespace blink {
 
 class WebCompositeAndReadbackAsyncCallback;
 class WebLayer;
 class WebLayoutAndPaintAsyncCallback;
 struct WebPoint;
 class WebSelection;
 
 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&) {}
   virtual void clearRootLayer() {}
 
-  // TODO(loyso): These should use CompositorAnimationTimeline. crbug.com/584551
-  virtual void attachCompositorAnimationTimeline(cc::AnimationTimeline*) {}
-  virtual void detachCompositorAnimationTimeline(cc::AnimationTimeline*) {}
+  // TODO(loyso): This should use CompositorAnimationHost. crbug.com/584551
+  virtual cc::AnimationHost* compositorAnimationHost() { return nullptr; }
 
   // View properties ---------------------------------------------------
 
   // Viewport size is given in physical pixels.
   virtual void setViewportSize(const WebSize& deviceViewportSize) {}
   virtual WebSize getViewportSize() const { return WebSize(); }
 
   virtual void setDeviceScaleFactor(float) {}
 
   // Sets the background color for the viewport.
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   // Toggles the debug borders on layers
   virtual void setShowDebugBorders(bool) {}
 
   // Toggles scroll bottleneck rects on the HUD layer
   virtual void setShowScrollBottleneckRects(bool) {}
 };
 
 }  // namespace blink
 
 #endif  // WebLayerTreeView_h