Minimum implementation of ARC clipboard Bridge

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 39072fd71c834083bfb9f18fb5995ac8df04a350..bf6c69698dbee1aefc4ed04d7232c65b5c637be3 100644
--- a/components/arc/arc_bridge_service.cc
+++ b/components/arc/arc_bridge_service.cc
@@ -78,6 +78,16 @@ void ArcBridgeService::RemoveAppObserver(AppObserver* observer) {
   app_observer_list_.RemoveObserver(observer);
 }
 
+void ArcBridgeService::AddClipboardObserver(ClipboardObserver* observer) {
+  DCHECK(origin_task_runner()->RunsTasksOnCurrentThread());
+  clipboard_observer_list_.AddObserver(observer);
+}
+
+void ArcBridgeService::RemoveClipboardObserver(ClipboardObserver* observer) {
+  DCHECK(origin_task_runner()->RunsTasksOnCurrentThread());
+  clipboard_observer_list_.RemoveObserver(observer);
+}
+
 void ArcBridgeService::SetState(State state) {
   DCHECK(origin_task_runner()->RunsTasksOnCurrentThread());
   // DCHECK on enum classes not supported.