Stop painting when receiving delegated frame

ui/compositor/layer.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_COMPOSITOR_LAYER_H_
 #define UI_COMPOSITOR_LAYER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 300 matching lines @@
   const SkRegion& damaged_region() const { return damaged_region_; }
 
   void CompleteAllAnimations();
 
   // Suppresses painting the content by disconnecting |delegate_|.
   void SuppressPaint();
 
   // Notifies the layer that the device scale factor has changed.
   void OnDeviceScaleFactorChanged(float device_scale_factor);
 
+  // Notifies the layer that one of its children has received a new
+  // delegated frame.
+  void OnDelegatedFrameDamage(const gfx::Rect &damage_rect_in_dip);
+
   // Requets a copy of the layer's output as a texture or bitmap.
   void RequestCopyOfOutput(scoped_ptr<cc::CopyOutputRequest> request);
 
   // ContentLayerClient
   virtual void PaintContents(
       SkCanvas* canvas,
       const gfx::Rect& clip,
       gfx::RectF* opaque,
       ContentLayerClient::GraphicsContextStatus gc_status) OVERRIDE;
   virtual void DidChangeLayerCanUseLCDText() OVERRIDE {}
@@ skipping 177 matching lines @@
   // The size of the frame or texture in DIP, set when SetShowDelegatedContent
   // or SetTextureMailbox was called.
   gfx::Size frame_size_in_dip_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_LAYER_H_