Plumb GpuMemoryBuffer allocation to GPU process.

content/browser/gpu/gpu_process_host.h

Index: content/browser/gpu/gpu_process_host.h
diff --git a/content/browser/gpu/gpu_process_host.h b/content/browser/gpu/gpu_process_host.h
index 17adefc088953cf37899020f9c98658d352b8cfa..eaa41584366e64d6dbe9c22cd09467be78a472ed 100644
--- a/content/browser/gpu/gpu_process_host.h
+++ b/content/browser/gpu/gpu_process_host.h
@@ -34,6 +34,11 @@ struct GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params;
 struct GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params;
 struct GpuHostMsg_AcceleratedSurfaceRelease_Params;
 
+namespace gfx {
+struct GpuMemoryBufferHandle;
+struct GpuMemoryBufferParams;
+}
+
 namespace IPC {
 struct ChannelHandle;
 }
@@ -63,6 +68,9 @@ class GpuProcessHost : public BrowserChildProcessHostDelegate,
 
   typedef base::Callback<void(const gfx::Size)> CreateImageCallback;
 
+  typedef base::Callback<void(const gfx::GpuMemoryBufferHandle& handle)>
+      AllocateGpuMemoryBufferCallback;
+
   static bool gpu_enabled() { return gpu_enabled_; }
 
   // Creates a new GpuProcessHost or gets an existing one, resulting in the
@@ -122,6 +130,9 @@ class GpuProcessHost : public BrowserChildProcessHostDelegate,
       int image_id,
       const CreateImageCallback& callback);
 
+  void AllocateGpuMemoryBuffer(const gfx::GpuMemoryBufferParams& params,
+                               const AllocateGpuMemoryBufferCallback& callback);
+
     // Tells the GPU process to delete image.
   void DeleteImage(int client_id, int image_id, int sync_point);
 
@@ -159,6 +170,7 @@ class GpuProcessHost : public BrowserChildProcessHostDelegate,
   void OnCommandBufferCreated(bool succeeded);
   void OnDestroyCommandBuffer(int32 surface_id);
   void OnImageCreated(const gfx::Size size);
+  void OnGpuMemoryBufferAllocated(const gfx::GpuMemoryBufferHandle& handle);
   void OnDidCreateOffscreenContext(const GURL& url);
   void OnDidLoseContext(bool offscreen,
                         gpu::error::ContextLostReason reason,
@@ -196,6 +208,9 @@ class GpuProcessHost : public BrowserChildProcessHostDelegate,
   // The pending create image requests we need to reply to.
   std::queue<CreateImageCallback> create_image_requests_;
 
+  // The pending allocate requests we need to reply to.
+  std::queue<AllocateGpuMemoryBufferCallback>
+      allocate_gpu_memory_buffer_requests_;
 
   // Qeueud messages to send when the process launches.
   std::queue<IPC::Message*> queued_messages_;