Plumb GpuMemoryBuffer allocation to GPU process.

content/common/gpu/gpu_channel_manager.h

Index: content/common/gpu/gpu_channel_manager.h
diff --git a/content/common/gpu/gpu_channel_manager.h b/content/common/gpu/gpu_channel_manager.h
index 2064046e1f3a39e186456d4a020b5e8dee939d37..912aaa093832ecaed53e0807b61815519f48c867 100644
--- a/content/common/gpu/gpu_channel_manager.h
+++ b/content/common/gpu/gpu_channel_manager.h
@@ -28,6 +28,7 @@ class WaitableEvent;
 
 namespace gfx {
 class GLShareGroup;
+struct GpuMemoryBufferParams;
 }
 
 namespace gpu {
@@ -123,6 +124,7 @@ class GpuChannelManager : public IPC::Listener,
       gfx::PluginWindowHandle window, int32 client_id, int32 image_id);
   void OnCreateImage(
       gfx::PluginWindowHandle window, int32 client_id, int32 image_id);
+  void OnAllocateGpuMemoryBuffer(const gfx::GpuMemoryBufferParams& params);
   void DeleteImage(int32 client_id, int32 image_id);
   void OnDeleteImage(int32 client_id, int32 image_id, int32 sync_point);
   void OnDeleteImageSyncPointRetired(ImageOperation*);