gpu: Associate all GpuMemoryBuffers with unique IDs.

content/browser/gpu/browser_gpu_memory_buffer_manager.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_BROWSER_GPU_BROWSER_GPU_MEMORY_BUFFER_MANAGER_H_
 #define CONTENT_BROWSER_GPU_BROWSER_GPU_MEMORY_BUFFER_MANAGER_H_
 
 #include "base/callback.h"
 #include "content/common/content_export.h"
 #include "gpu/command_buffer/client/gpu_memory_buffer_manager.h"
@@ skipping 24 matching lines @@
 
   void AllocateGpuMemoryBufferForChildProcess(
       const gfx::Size& size,
       gfx::GpuMemoryBuffer::Format format,
       gfx::GpuMemoryBuffer::Usage usage,
       base::ProcessHandle child_process_handle,
       int child_client_id,
       const AllocationCallback& callback);
   void ChildProcessDeletedGpuMemoryBuffer(
       gfx::GpuMemoryBufferType type,
-      const gfx::GpuMemoryBufferId& id,
+      gfx::GpuMemoryBufferId id,
       base::ProcessHandle child_process_handle,
       int child_client_id,
       uint32 sync_point);
   void ProcessRemoved(base::ProcessHandle process_handle);
 
  private:
   struct AllocateGpuMemoryBufferRequest;
 
   static void AllocateGpuMemoryBufferOnIO(
       AllocateGpuMemoryBufferRequest* request);
   static void GpuMemoryBufferCreatedOnIO(
       AllocateGpuMemoryBufferRequest* request,
       scoped_ptr<GpuMemoryBufferImpl> buffer);
 
   int gpu_client_id_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GPU_BROWSER_GPU_MEMORY_BUFFER_MANAGER_H_