Impl mus::mojom::GpuService to enable using Chrome IPC version gpu CmdBuf in mus

components/mus/public/cpp/gpu_service.h

Index: components/mus/public/cpp/gpu_service.h
diff --git a/components/mus/public/cpp/gpu_service.h b/components/mus/public/cpp/gpu_service.h
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+++ b/components/mus/public/cpp/gpu_service.h
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+// Copyright 2016 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 COMPONENTS_MUS_PUBLIC_CPP_GPU_SERVICE_H_
+#define COMPONENTS_MUS_PUBLIC_CPP_GPU_SERVICE_H_
+
+#include <stdint.h>
+#include <vector>
+
+#include "base/callback.h"
+#include "base/lazy_instance.h"
+#include "base/macros.h"
+#include "base/observer_list.h"
+#include "base/synchronization/waitable_event.h"
+#include "base/threading/thread.h"
+#include "components/mus/common/types.h"
+#include "components/mus/public/cpp/mus_public_export.h"
+#include "components/mus/public/interfaces/mus_constants.mojom.h"
+#include "components/mus/public/interfaces/surface_id.mojom.h"
+#include "components/mus/public/interfaces/window_tree.mojom.h"
+#include "gpu/ipc/client/gpu_channel_host.h"
+#include "mojo/public/cpp/bindings/array.h"
+#include "services/shell/public/interfaces/interface_provider.mojom.h"
+#include "ui/gfx/geometry/insets.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace shell {
+class Connector;
+}
+
+namespace mus {
+
+class GpuMemoryBufferManagerMus;
+
+class MUS_PUBLIC_EXPORT GpuService : public gpu::GpuChannelHostFactory {
+ public:
+  GpuService();
+  ~GpuService() override;
+
+  scoped_refptr<gpu::GpuChannelHost> gpu_channel_host() { return gpu_channel_; }
+
+  static bool UseChromeGpuCommandBuffer();
+  static void Initialize(shell::Connector* connector);
+  static GpuService* GetInstance();
+
+ private:
+  void Init(shell::Connector* connector);
+
+  // gpu::GpuChannelHostFactory overrides:
+  bool IsMainThread() override;
+  scoped_refptr<base::SingleThreadTaskRunner> GetIOThreadTaskRunner() override;
+  std::unique_ptr<base::SharedMemory> AllocateSharedMemory(
+      size_t size) override;
+
+  bool initialized_;
+  base::MessageLoop* main_message_loop_;
+  base::WaitableEvent shutdown_event_;
+  base::Thread io_thread_;
+  std::unique_ptr<GpuMemoryBufferManagerMus> gpu_memory_buffer_manager_;
+  scoped_refptr<gpu::GpuChannelHost> gpu_channel_;
+};
+
+}  // namespace mus
+
+#endif  // COMPONENTS_MUS_PUBLIC_CPP_GPU_SERVICE_CONNECTION_H_