Decoupling backbuffer allocation suggestion from frontbuffer allocation suggestion.

content/common/gpu/texture_image_transport_surface.h

Index: content/common/gpu/texture_image_transport_surface.h
diff --git a/content/common/gpu/texture_image_transport_surface.h b/content/common/gpu/texture_image_transport_surface.h
index 4d77725ce87de4dc4f301a03f3700b3197564791..3a3001a8b6e89de4fd6c317fe2beca191d2b069a 100644
--- a/content/common/gpu/texture_image_transport_surface.h
+++ b/content/common/gpu/texture_image_transport_surface.h
@@ -35,7 +35,8 @@ class TextureImageTransportSurface :
   virtual unsigned int GetBackingFrameBufferObject() OVERRIDE;
   virtual bool PostSubBuffer(int x, int y, int width, int height) OVERRIDE;
   virtual bool OnMakeCurrent(gfx::GLContext* context) OVERRIDE;
-  virtual void SetBufferAllocation(BufferAllocationState state) OVERRIDE;
+  virtual void SetBackbufferAllocation(bool allocated) OVERRIDE;
+  virtual void SetFrontbufferAllocation(bool allocated) OVERRIDE;
   virtual void* GetShareHandle() OVERRIDE;
   virtual void* GetDisplay() OVERRIDE;
   virtual void* GetConfig() OVERRIDE;
@@ -77,6 +78,7 @@ class TextureImageTransportSurface :
   void AttachBackTextureToFBO();
   void ReleaseParentStub();
   int back() const { return 1 - front_; }
+  void AdjustBufferAllocations();
 
   // The framebuffer that represents this surface (service id). Allocated lazily
   // in OnMakeCurrent.
@@ -93,6 +95,9 @@ class TextureImageTransportSurface :
   // Whether or not the command buffer stub has been destroyed.
   bool stub_destroyed_;
 
+  bool backbuffer_suggested_allocation_;
+  bool frontbuffer_suggested_allocation_;
+
   scoped_ptr<ImageTransportHelper> helper_;
   GpuCommandBufferStub* parent_stub_;