arc: Revamp the ArcBridgeService interface

chrome/browser/chromeos/arc/gpu_arc_video_service_host.h

Index: chrome/browser/chromeos/arc/gpu_arc_video_service_host.h
diff --git a/chrome/browser/chromeos/arc/gpu_arc_video_service_host.h b/chrome/browser/chromeos/arc/gpu_arc_video_service_host.h
index 4fb2c67084a8006b4a7eecbf0a17d00a6d03c291..c9dba52364448921b47bcbcabafa02c14f3d1d18 100644
--- a/chrome/browser/chromeos/arc/gpu_arc_video_service_host.h
+++ b/chrome/browser/chromeos/arc/gpu_arc_video_service_host.h
@@ -20,15 +20,18 @@ namespace arc {
 //
 // This class is the proxy end of GpuArcVideoService and runs in the browser
 // process. The corresponding end "GpuArcVideoService" runs in the GPU process.
-class GpuArcVideoServiceHost : public arc::ArcService,
-                               public arc::ArcBridgeService::Observer,
-                               public arc::mojom::VideoHost {
+class GpuArcVideoServiceHost
+    : public arc::ArcService,
+      public arc::ArcBridgeService::InstanceObserver<mojom::VideoInstance>,
+      public arc::mojom::VideoHost {
  public:
   explicit GpuArcVideoServiceHost(arc::ArcBridgeService* bridge_service);
   ~GpuArcVideoServiceHost() override;
 
-  // arc::ArcBridgeService::Observer implementation.
-  void OnVideoInstanceReady() override;
+  // arc::ArcBridgeService::InstanceObserver<mojom::VideoInstance>
+  // implementation.
+  void OnInstanceReady(mojom::VideoInstance* video_instance,
+                       uint32_t version) override;
 
   // arc::mojom::VideoHost implementation.
   void DeprecatedOnRequestArcVideoAcceleratorChannel(