Sample code: IPC Transport object for GPU

content/gpu/gpu_memory_buffer_service.h

Index: content/gpu/gpu_memory_buffer_service.h
diff --git a/content/gpu/gpu_memory_buffer_service.h b/content/gpu/gpu_memory_buffer_service.h
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+// Copyright 2015 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_GPU_GPU_MEMORY_BUFFER_SERVICE_H_
+#define CONTENT_GPU_GPU_MEMORY_BUFFER_SERVICE_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "content/gpu/gpu_memory_buffer_service_ipc_transport.h"
+#include "ipc/message_filter.h"
+
+namespace content {
+
+class GpuMemoryBufferFactory;
+struct CreateGpuMemoryBufferFromHandleParams;
+struct CreateGpuMemoryBufferParams;
+
+// Message filter used to to handle GpuMsg_CreateGpuMemoryBuffer messages on
+// the IO thread. This allows the UI thread in the browser process to remain
+// fast at all times.
+class GpuMemoryBufferService
+    : public GpuMemoryBufferServiceIPCTransport::Client {
+ public:
+  explicit GpuMemoryBufferService(
+      GpuMemoryBufferFactory* gpu_memory_buffer_factory);
+
+  GpuMemoryBufferServiceIPCTransport* transport() { return transport_.get(); }
+
+ private:
+  ~GpuMemoryBufferService() override;
+
+  // GpuMemoryBufferServiceIPCTransport::Client:
+  void OnConnectionClosed() override;
+  void OnCreateGpuMemoryBuffer(
+      const CreateGpuMemoryBufferParams& params) override;
+  void OnCreateGpuMemoryBufferFromHandle(
+      const CreateGpuMemoryBufferFromHandleParams& params) override;
+
+  scoped_ptr<GpuMemoryBufferServiceIPCTransport> transport_;
+  GpuMemoryBufferFactory* const gpu_memory_buffer_factory_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_GPU_GPU_MEMROY_BUFFER_SERVICE_H_