Implement GpuArcVideoService for arc video accelerator

components/arc/arc_bridge_service.cc

Index: components/arc/arc_bridge_service.cc
diff --git a/components/arc/arc_bridge_service.cc b/components/arc/arc_bridge_service.cc
index c0559d3efdd1c77e41a70d65997c710018999553..719a79d2eb998bbb529d2dffc280c2041c939215 100644
--- a/components/arc/arc_bridge_service.cc
+++ b/components/arc/arc_bridge_service.cc
@@ -22,7 +22,7 @@ ArcBridgeService* g_arc_bridge_service = nullptr;
 }  // namespace
 
 ArcBridgeService::ArcBridgeService()
-    : available_(false), state_(State::STOPPED) {
+    : video_service_(nullptr), available_(false), state_(State::STOPPED) {
   DCHECK(!g_arc_bridge_service);
   g_arc_bridge_service = this;
 }
@@ -87,6 +87,11 @@ void ArcBridgeService::RemoveProcessObserver(ProcessObserver* observer) {
   process_observer_list_.RemoveObserver(observer);
 }
 
+void ArcBridgeService::SetVideoService(VideoService* service) {
+  DCHECK(CalledOnValidThread());
+  video_service_ = service;
+}
+
 void ArcBridgeService::SetState(State state) {
   DCHECK(CalledOnValidThread());
   // DCHECK on enum classes not supported.