Adding monotonic only API to Blink's animation delegate interface

Source/web/PageOverlay.cpp

 /*
  * 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.
  *
@@ skipping 54 matching lines @@
 
 class OverlayGraphicsLayerClientImpl : public WebCore::GraphicsLayerClient {
 public:
     static PassOwnPtr<OverlayGraphicsLayerClientImpl> create(WebPageOverlay* overlay)
     {
         return adoptPtr(new OverlayGraphicsLayerClientImpl(overlay));
     }
 
     virtual ~OverlayGraphicsLayerClientImpl() { }
 
-    virtual void notifyAnimationStarted(const GraphicsLayer*, double wallClockTime, double monotonicTime) OVERRIDE { }
+    virtual void notifyAnimationStarted(const GraphicsLayer*, double monotonicTime) OVERRIDE { }
 
     virtual void paintContents(const GraphicsLayer*, GraphicsContext& gc, GraphicsLayerPaintingPhase, const IntRect& inClip)
     {
         gc.save();
         m_overlay->paintPageOverlay(ToWebCanvas(&gc));
         gc.restore();
     }
 
     virtual String debugName(const GraphicsLayer* graphicsLayer) OVERRIDE
     {
@@ skipping 75 matching lines @@
         // this is not on a critical codepath? In order to do so, we'd
         // have to take scrolling into account.
         const WebSize& size = m_viewImpl->size();
         WebRect damagedRect(0, 0, size.width, size.height);
         if (m_viewImpl->client())
             m_viewImpl->client()->didInvalidateRect(damagedRect);
     }
 }
 
 } // namespace blink