Implement GpuArcVideoService for arc video accelerator

content/browser/gpu/gpu_arc_video_service_host.h

Index: content/browser/gpu/gpu_arc_video_service_host.h
diff --git a/content/browser/gpu/gpu_arc_video_service_host.h b/content/browser/gpu/gpu_arc_video_service_host.h
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+++ b/content/browser/gpu/gpu_arc_video_service_host.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_BROWSER_GPU_GPU_ARC_VIDEO_SERVICE_HOST_H_
+#define CONTENT_BROWSER_GPU_GPU_ARC_VIDEO_SERVICE_HOST_H_
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "components/arc/arc_bridge_service.h"
+#include "components/arc/common/video.mojom.h"
+#include "components/arc/video/arc_video_service.h"
+#include "ipc/ipc_channel_handle.h"
+#include "mojo/public/cpp/bindings/binding.h"
+
+namespace content {
+
+// This class passes requests from ArcBridgeService to GpuArcVideoService to
+// create a video accelerator channel in GPU process and sends the created
+// channel back to ArcBridgeService.
+class GpuArcVideoServiceHost : public arc::VideoHost,
+                               public arc::ArcVideoService,
+                               public arc::ArcBridgeService::Observer {
+ public:
+  GpuArcVideoServiceHost();
+  ~GpuArcVideoServiceHost() override;
+
+  // arc::ArcVideoService implementation.
+  void Initialize() override;
+
+  // arc::ArcBridgeService::Observer implementation.
+  void OnStateChanged(arc::ArcBridgeService::State state) override;
+  void OnVideoInstanceReady() override;
+
+  // arc::VideoHost implementation.
+  void OnRequestArcVideoAcceleratorChannel(
+      const OnRequestArcVideoAcceleratorChannelCallback& callback) override;
+
+ private:
+  void HandleChannelCreatedReply(
+      const OnRequestArcVideoAcceleratorChannelCallback& callback,
+      const IPC::ChannelHandle& handle);
+
+  void Shutdown();
+
+  base::ThreadChecker thread_checker_;
+
+  // IO task runner, where GpuProcessHost tasks run.
+  scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
+
+  mojo::Binding<arc::VideoHost> binding_;
+
+  base::WeakPtrFactory<GpuArcVideoServiceHost> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(GpuArcVideoServiceHost);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_GPU_GPU_ARC_VIDEO_SERVICE_HOST_H_