Turn off computation of the interest rect in cc in synchronized paint mode.

ui/compositor/layer.h

Index: ui/compositor/layer.h
diff --git a/ui/compositor/layer.h b/ui/compositor/layer.h
index 187a3d9fcae1d180106e5572d46c376d59aef558..dfd4eb0054aa5ef352f6749b20f0d3e5ea436512 100644
--- a/ui/compositor/layer.h
+++ b/ui/compositor/layer.h
@@ -348,6 +348,7 @@ class COMPOSITOR_EXPORT Layer
   void RequestCopyOfOutput(scoped_ptr<cc::CopyOutputRequest> request);
 
   // ContentLayerClient
+  gfx::Rect PaintableRegion() override;
   scoped_refptr<cc::DisplayItemList> PaintContentsToDisplayList(
       const gfx::Rect& clip,
       ContentLayerClient::PaintingControlSetting painting_control) override;