Web Animations: Plumb compositor group id through animation creation and start/finish notifications

Source/core/frame/PinchViewport.cpp

 /*
  * 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 426 matching lines @@
 GraphicsLayer* PinchViewport::layerForHorizontalScrollbar() const
 {
     return m_overlayScrollbarHorizontal.get();
 }
 
 GraphicsLayer* PinchViewport::layerForVerticalScrollbar() const
 {
     return m_overlayScrollbarVertical.get();
 }
 
-void PinchViewport::notifyAnimationStarted(const GraphicsLayer*, double monotonicTime)
-{
-}
-
 void PinchViewport::paintContents(const GraphicsLayer*, GraphicsContext&, GraphicsLayerPaintingPhase, const IntRect& inClip)
 {
 }
 
 LocalFrame* PinchViewport::mainFrame() const
 {
     return frameHost().page().mainFrame() && frameHost().page().mainFrame()->isLocalFrame() ? frameHost().page().deprecatedLocalMainFrame() : 0;
 }
 
 FloatPoint PinchViewport::clampOffsetToBoundaries(const FloatPoint& offset)
@@ skipping 23 matching lines @@
     } else if (graphicsLayer == m_overlayScrollbarVertical.get()) {
         name =  "Overlay Scrollbar Vertical Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink