Enable sync allocation of GpuMemoryBuffers from the browser process.

content/browser/gpu/gpu_memory_buffer_factory_host_impl.h

+// Copyright (c) 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_GPU_MEMORY_BUFFER_FACTORY_HOST_IMPL_H_
+#define CONTENT_BROWSER_GPU_GPU_MEMORY_BUFFER_FACTORY_HOST_IMPL_H_
+
+#include <map>
+
+#include "content/common/gpu/client/gpu_memory_buffer_factory_host.h"
+
+namespace content {
+class GpuMemoryBufferImpl;
+
+class CONTENT_EXPORT GpuMemoryBufferFactoryHostImpl
+    : public GpuMemoryBufferFactoryHost {
+ public:
+  GpuMemoryBufferFactoryHostImpl();
+  virtual ~GpuMemoryBufferFactoryHostImpl();
+
+  // GpuMemoryBufferFactoryHost implementation.

[reveman, 2014/09/09 23:17:54]

nit: I typically use "Overridden from GpuMemoryBufferFactoryHost:" in
GpuMemoryBuffer related code.

[alexst (slow to review), 2014/09/10 01:57:49]

Done.

+  virtual void CreateGpuMemoryBuffer(
+      const gfx::GpuMemoryBufferHandle& handle,
+      const gfx::Size& size,
+      unsigned internalformat,
+      unsigned usage,
+      const CreateGpuMemoryBufferCallback& callback) OVERRIDE;
+  virtual void DestroyGpuMemoryBuffer(const gfx::GpuMemoryBufferHandle& handle,
+                                      int32 sync_point) OVERRIDE;

[reveman, 2014/09/09 23:17:54]

nit: please add a blank line here to separate set_gpu_host_id from the functions
that implement the GpuMemoryBufferFactoryHost interface.

[alexst (slow to review), 2014/09/10 01:57:49]

Done.

+  void set_gpu_host_id(int gpu_host_id) { gpu_host_id_ = gpu_host_id; }
+
+ private:
+  void OnGpuMemoryBufferCreated(uint32 request_id,
+                                const gfx::GpuMemoryBufferHandle& handle);
+
+  int gpu_host_id_;
+  uint32 next_create_gpu_memory_buffer_request_id_;
+  typedef std::map<uint32, CreateGpuMemoryBufferCallback>
+      CreateGpuMemoryBufferCallbackMap;
+  CreateGpuMemoryBufferCallbackMap create_gpu_memory_buffer_requests_;
+
+  DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferFactoryHostImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_GPU_GPU_MEMORY_BUFFER_FACTORY_HOST_IMPL_H_