Enable sync allocation of GpuMemoryBuffers from the browser 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 65eb1f1340f5415acb202a46b7a14e0dcdae31a8..31276bd40c5c6d3c16bdccc8008903a56f603de8 100644
--- a/content/common/gpu/gpu_channel_manager.h
+++ b/content/common/gpu/gpu_channel_manager.h
@@ -41,6 +41,8 @@ class ShaderTranslatorCache;
 
 namespace IPC {
 struct ChannelHandle;
+class SyncChannel;
+class MessageFilter;
 }
 
 struct GPUCreateCommandBufferConfig;
@@ -61,7 +63,8 @@ class GpuChannelManager : public IPC::Listener,
   GpuChannelManager(MessageRouter* router,
                     GpuWatchdog* watchdog,
                     base::MessageLoopProxy* io_message_loop,
-                    base::WaitableEvent* shutdown_event);
+                    base::WaitableEvent* shutdown_event,
+                    IPC::SyncChannel* channel);
   virtual ~GpuChannelManager();
 
   // Remove the channel for a particular renderer.
@@ -128,15 +131,8 @@ class GpuChannelManager : public IPC::Listener,
       const GPUCreateCommandBufferConfig& init_params,
       int32 route_id);
   void OnLoadedShader(std::string shader);
-  void CreateGpuMemoryBuffer(const gfx::GpuMemoryBufferHandle& handle,
-                             const gfx::Size& size,
-                             unsigned internalformat,
-                             unsigned usage);
-  void OnCreateGpuMemoryBuffer(const gfx::GpuMemoryBufferHandle& handle,
-                               const gfx::Size& size,
-                               unsigned internalformat,
-                               unsigned usage);
   void DestroyGpuMemoryBuffer(const gfx::GpuMemoryBufferHandle& handle);
+  void DestroyGpuMemoryBufferOnIO(const gfx::GpuMemoryBufferHandle& handle);
   void OnDestroyGpuMemoryBuffer(const gfx::GpuMemoryBufferHandle& handle,
                                 int32 sync_point);
   void OnDestroyGpuMemoryBufferSyncPointRetired(
@@ -165,6 +161,8 @@ class GpuChannelManager : public IPC::Listener,
   scoped_refptr<gfx::GLSurface> default_offscreen_surface_;
   GpuMemoryBufferOperationQueue gpu_memory_buffer_operations_;
   scoped_ptr<GpuMemoryBufferFactory> gpu_memory_buffer_factory_;
+  IPC::SyncChannel* channel_;
+  scoped_refptr<IPC::MessageFilter> filter_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannelManager);
 };