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 12aae9d30f76d063bda8a67dfb05e6add5973802..b9f06b198fdfb3e2e8d8f2cc602b88e6de6436c3 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() {}
   };
@@ -149,6 +152,7 @@ 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;
@@ -158,6 +162,7 @@ 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_; }
@@ -191,6 +196,7 @@ class ArcBridgeService : public ArcBridgeHost {
   PowerInstancePtr power_ptr_;
   ProcessInstancePtr process_ptr_;
   SettingsInstancePtr settings_ptr_;
+  VideoInstancePtr video_ptr_;
 
   base::ObserverList<Observer> observer_list_;