Implement GpuArcVideoService for arc video accelerator

components/arc/video/arc_video_bridge.h

Index: components/arc/video/arc_video_bridge.h
diff --git a/components/arc/video/arc_video_bridge.h b/components/arc/video/arc_video_bridge.h
new file mode 100644
index 0000000000000000000000000000000000000000..f781a5ef2de6a74a504346a5d7727d32676dff3a
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+++ b/components/arc/video/arc_video_bridge.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_ARC_VIDEO_ARC_VIDEO_BRIDGE_H
+#define COMPONENTS_ARC_VIDEO_ARC_VIDEO_BRIDGE_H
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "components/arc/arc_bridge_service.h"
+#include "components/arc/video/video_host_delegate.h"
+#include "mojo/public/cpp/bindings/binding.h"
+
+namespace arc {
+
+class VideoHostDelegate;
+
+// ArcVideoBridge bridges ArcBridgeService and VideoHostDelegate. It observes
+// ArcBridgeService events and pass VideoHost proxy to VideoInstance.
+class ArcVideoBridge : public ArcBridgeService::Observer {
+ public:
+  explicit ArcVideoBridge(scoped_ptr<VideoHostDelegate> video_host_delegate);
+  ~ArcVideoBridge() override;
+
+  // Starts listening to state changes of the ArcBridgeService.
+  void StartObservingBridgeServiceChanges();
+
+  // arc::ArcBridgeService::Observer implementation.
+  void OnStateChanged(arc::ArcBridgeService::State state) override;
+  void OnVideoInstanceReady() override;
+
+ private:
+  scoped_ptr<VideoHostDelegate> video_host_delegate_;
+  mojo::Binding<arc::VideoHost> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcVideoBridge);
+};
+
+}  // namespace arc
+
+#endif  // COMPONENTS_ARC_VIDEO_ARC_VIDEO_BRIDGE_H