Implement GpuArcVideoService for arc video accelerator

content/browser/gpu/gpu_arc_video_service_host.h

+// 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_BROWSER_GPU_GPU_ARC_VIDEO_SERVICE_HOST_H_
+#define CONTENT_BROWSER_GPU_GPU_ARC_VIDEO_SERVICE_HOST_H_
+
+#include <queue>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "base/threading/non_thread_safe.h"
+#include "components/arc/arc_bridge_service.h"
+#include "ipc/ipc_channel_handle.h"
+#include "ipc/ipc_listener.h"
+
+namespace content {
+
+class GpuArcVideoServiceHost

[Pawel Osciak, 2015/12/16 10:17:58]

Please add a short description of what this class does.

[kcwu, 2015/12/16 14:05:33]

Done.

+    : public base::NonThreadSafe,
+      public arc::ArcBridgeService::Observer,
+      public arc::ArcBridgeService::VideoServiceObserver {
+ public:
+  GpuArcVideoServiceHost(
+      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner);
+  ~GpuArcVideoServiceHost() override;
+
+  void Initialize();
+
+  // arc::ArcBridgeService::Observer implementation.
+  void OnStateChanged(arc::ArcBridgeService::State state) override;
+
+  // arc::ArcBridgeService::VideoServiceObserver implementation.
+  void OnRequestArcVideoAcceleratorChannel() override;
+
+ private:
+  void NotifyArcAcceleratorChannelCreated(const IPC::ChannelHandle& handle);
+  void Shutdown();
+
+  scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
+  int num_pending_request_;

[Pawel Osciak, 2015/12/16 10:17:58]

Please document.

s/num_pending_request_/num_pending_requests_/

[kcwu, 2015/12/16 14:05:33]

Done.

+  base::WeakPtrFactory<GpuArcVideoServiceHost> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(GpuArcVideoServiceHost);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_GPU_GPU_ARC_VIDEO_SERVICE_HOST_H_