Implement GpuArcVideoService for arc video accelerator

components/arc/arc_bridge_service.h

Index: components/arc/arc_bridge_service.h
diff --git a/components/arc/arc_bridge_service.h b/components/arc/arc_bridge_service.h
index 6e8c885b7f6508e7438e6a5ec457eacd53824a4f..855a2e8bdeaab620dbebe42d3a01e2c14a9c63ea 100644
--- a/components/arc/arc_bridge_service.h
+++ b/components/arc/arc_bridge_service.h
@@ -91,6 +91,9 @@ class ArcBridgeService : public ArcBridgeHost {
     // Called whenever the ARC settings is ready.
     virtual void OnSettingsInstanceReady() {}
 
+    // Called whenever the ARC video is ready.
+    virtual void OnVideoInstanceReady() {}
+
    protected:
     virtual ~Observer() {}
   };
@@ -136,6 +139,7 @@ class ArcBridgeService : public ArcBridgeHost {
   PowerInstance* power_instance() { return power_ptr_.get(); }
   ProcessInstance* process_instance() { return process_ptr_.get(); }
   SettingsInstance* settings_instance() { return settings_ptr_.get(); }
+  VideoInstance* video_instance() { return video_ptr_.get(); }
 
   // ArcHost:
   void OnAppInstanceReady(AppInstancePtr app_ptr) override;
@@ -145,6 +149,7 @@ class ArcBridgeService : public ArcBridgeHost {
   void OnPowerInstanceReady(PowerInstancePtr power_ptr) override;
   void OnProcessInstanceReady(ProcessInstancePtr process_ptr) override;
   void OnSettingsInstanceReady(SettingsInstancePtr process_ptr) override;
+  void OnVideoInstanceReady(VideoInstancePtr video_ptr) override;
 
   // Gets the current state of the bridge service.
   State state() const { return state_; }
@@ -178,6 +183,7 @@ class ArcBridgeService : public ArcBridgeHost {
   PowerInstancePtr power_ptr_;
   ProcessInstancePtr process_ptr_;
   SettingsInstancePtr settings_ptr_;
+  VideoInstancePtr video_ptr_;
 
   base::ObserverList<Observer> observer_list_;