Enable sync allocation of GpuMemoryBuffers from the browser process.

content/common/gpu/client/gpu_memory_buffer_factory_host.h

 // Copyright 2014 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 CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_FACTORY_HOST_H_
 #define CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_FACTORY_HOST_H_
 
 #include "base/callback.h"
 #include "content/common/content_export.h"
 
@@ skipping 10 matching lines @@
       CreateGpuMemoryBufferCallback;
 
   static GpuMemoryBufferFactoryHost* GetInstance();
 
   virtual void CreateGpuMemoryBuffer(
       const gfx::GpuMemoryBufferHandle& handle,
       const gfx::Size& size,
       unsigned internalformat,
       unsigned usage,
       const CreateGpuMemoryBufferCallback& callback) = 0;
+  // This function is to be called only for images allocated from the
+  // browser process command buffer. Allocations originating from the renderers
+  // should use the async version of the function.
+  virtual gfx::GpuMemoryBufferHandle CreateGpuMemoryBufferSync(
+      const gfx::GpuMemoryBufferHandle& handle,
+      const gfx::Size& size,
+      unsigned internalformat,
+      unsigned usage) = 0;
   virtual void DestroyGpuMemoryBuffer(const gfx::GpuMemoryBufferHandle& handle,
                                       int32 sync_point) = 0;
 
  protected:
   GpuMemoryBufferFactoryHost();
   virtual ~GpuMemoryBufferFactoryHost();
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_FACTORY_HOST_H_