Animations: Introduce compositor AnimationPlayer and AnimationTimeline.

Source/core/page/ChromeClient.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple, Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 43 matching lines @@
 class GraphicsLayerFactory;
 class HitTestResult;
 class HTMLFormControlElement;
 class HTMLInputElement;
 class IntRect;
 class LocalFrame;
 class Node;
 class Page;
 class PagePopupDriver;
 class PopupMenuClient;
+class WebCompositorAnimationTimeline;
 
 struct CompositedSelectionBound;
 struct DateTimeChooserParameters;
 struct FrameLoadRequest;
 struct GraphicsDeviceAdapter;
 struct ViewportDescription;
 struct WindowFeatures;
 
 class ChromeClient {
 public:
@@ skipping 99 matching lines @@
     virtual void enumerateChosenDirectory(FileChooser*) = 0;
 
     // Allows ports to customize the type of graphics layers created by this page.
     virtual GraphicsLayerFactory* graphicsLayerFactory() const { return nullptr; }
 
     // Pass 0 as the GraphicsLayer to detach the root layer.
     // This sets the graphics layer for the LocalFrame's WebWidget, if it has one. Otherwise
     // it sets it for the WebViewImpl.
     virtual void attachRootGraphicsLayer(GraphicsLayer*, LocalFrame* localRoot) = 0;
 
+    virtual void attachCompositorAnimationTimeline(WebCompositorAnimationTimeline*, LocalFrame* localRoot) { }
+    virtual void detachCompositorAnimationTimeline(WebCompositorAnimationTimeline*, LocalFrame* localRoot) { }
+
     virtual void enterFullScreenForElement(Element*) { }
     virtual void exitFullScreenForElement(Element*) { }
 
     virtual void clearCompositedSelectionBounds() { }
     virtual void updateCompositedSelectionBounds(const CompositedSelectionBound& anchor, const CompositedSelectionBound& focus) { }
 
     virtual void needTouchEvents(bool) = 0;
 
     virtual void setTouchAction(TouchAction) = 0;
 
@@ skipping 41 matching lines @@
 
     virtual void didUpdateTopControls() const { }
 
 protected:
     virtual ~ChromeClient() { }
 };
 
 } // namespace blink
 
 #endif // ChromeClient_h