content: Fix lost context handling when using native GpuMemoryBuffers.

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"
-#include "ui/gfx/gpu_memory_buffer.h"
-
-namespace gfx {
-class Size;
-}
-
-namespace content {
-
-class CONTENT_EXPORT GpuMemoryBufferFactoryHost {
- public:
-  typedef base::Callback<void(const gfx::GpuMemoryBufferHandle& handle)>
-      CreateGpuMemoryBufferCallback;
-
-  virtual bool IsGpuMemoryBufferConfigurationSupported(
-      gfx::GpuMemoryBuffer::Format format,
-      gfx::GpuMemoryBuffer::Usage usage) = 0;
-  virtual void CreateGpuMemoryBuffer(
-      gfx::GpuMemoryBufferId id,
-      const gfx::Size& size,
-      gfx::GpuMemoryBuffer::Format format,
-      gfx::GpuMemoryBuffer::Usage usage,
-      int client_id,
-      int32 surface_id,
-      const CreateGpuMemoryBufferCallback& callback) = 0;
-  virtual void DestroyGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
-                                      int client_id,
-                                      int32 sync_point) = 0;
-
- protected:
-  virtual ~GpuMemoryBufferFactoryHost() {}
-};
-
-}  // namespace content
-
-#endif  // CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_FACTORY_HOST_H_