Add a new hook to WebLayerTreeView for requesting frames.

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
@@ skipping 87 matching lines @@
 
     // Set top controls height. If |shrinkViewport| is set to true, then Blink shrunk the viewport clip
     // layers by the top controls height.
     virtual void setTopControlsHeight(float height, bool shrinkViewport) { }
 
     // Flow control and scheduling ---------------------------------------
 
     // Indicates that an animation needs to be updated.
     virtual void setNeedsAnimate() = 0;
 
+    // Indicates that blink needs a BeginFrame, but that nothing might actually be dirty.
+    virtual void setNeedsBeginFrame() { }
+
+    // Indicates that blink needs a BeginFrame and to update compositor state.
+    virtual void setNeedsCompositorUpdate() { }
+
     // Indicates whether a commit is pending.
     virtual bool commitRequested() const = 0;
 
     // Relays the end of a fling animation.
     virtual void didStopFlinging() { }
 
     // Run layout and paint of all pending document changes asynchronously.
     // The caller is resposible for keeping the WebLayoutAndPaintAsyncCallback object
     // alive until it is called.
     virtual void layoutAndPaintAsync(WebLayoutAndPaintAsyncCallback*) { }
@@ skipping 43 matching lines @@
     // Toggles continuous painting
     virtual void setContinuousPaintingEnabled(bool) { }
 
     // Toggles scroll bottleneck rects on the HUD layer
     virtual void setShowScrollBottleneckRects(bool) { }
 };
 
 } // namespace blink
 
 #endif // WebLayerTreeView_h