Adding monotonic only API to Blink's animation delegate interface

Source/web/PinchViewports.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 49 matching lines @@
     WebCore::GraphicsLayer* rootGraphicsLayer()
     {
         return m_innerViewportContainerLayer.get();
     }
     void setViewportSize(const WebCore::IntSize&);
 
     void registerViewportLayersWithTreeView(WebLayerTreeView*) const;
     void clearViewportLayersForTreeView(WebLayerTreeView*) const;
 
     // GraphicsLayerClient implementation.
-    virtual void notifyAnimationStarted(const WebCore::GraphicsLayer*, double wallClockTime, double monotonicTime) OVERRIDE;
+    virtual void notifyAnimationStarted(const WebCore::GraphicsLayer*, double monotonicTime) OVERRIDE;
     virtual void paintContents(const WebCore::GraphicsLayer*, WebCore::GraphicsContext&, WebCore::GraphicsLayerPaintingPhase, const WebCore::IntRect& inClip) OVERRIDE;
 
     virtual String debugName(const WebCore::GraphicsLayer*) OVERRIDE;
 
 private:
     explicit PinchViewports(WebViewImpl* owner);
 
     void setupScrollbar(blink::WebScrollbar::Orientation);
 
     WebViewImpl* m_owner;
     OwnPtr<WebCore::GraphicsLayer> m_innerViewportContainerLayer;
     OwnPtr<WebCore::GraphicsLayer> m_pageScaleLayer;
     OwnPtr<WebCore::GraphicsLayer> m_innerViewportScrollLayer;
     OwnPtr<WebCore::GraphicsLayer> m_overlayScrollbarHorizontal;
     OwnPtr<WebCore::GraphicsLayer> m_overlayScrollbarVertical;
     OwnPtr<WebScrollbarLayer> m_webOverlayScrollbarHorizontal;
     OwnPtr<WebScrollbarLayer> m_webOverlayScrollbarVertical;
 };
 
 } // namespace blink
 
 #endif // PinchViewports_h