MediaRouterAction: Only observe Media Routes when there is a local route.

chrome/browser/media/router/media_router_mojo_impl.h

Index: chrome/browser/media/router/media_router_mojo_impl.h
diff --git a/chrome/browser/media/router/media_router_mojo_impl.h b/chrome/browser/media/router/media_router_mojo_impl.h
index a344e83c4445c78bfd79b0b27c64d662c914d43d..93e5e5937964352726c3dd6d42d16150cd921945 100644
--- a/chrome/browser/media/router/media_router_mojo_impl.h
+++ b/chrome/browser/media/router/media_router_mojo_impl.h
@@ -138,6 +138,10 @@ class MediaRouterMojoImpl : public MediaRouter,
       PresentationSessionMessagesObserver* observer) override;
   void UnregisterPresentationSessionMessagesObserver(
       PresentationSessionMessagesObserver* observer) override;
+  void RegisterLocalMediaRoutesObserver(
+      LocalMediaRoutesObserver* observer) override;
+  void UnregisterLocalMediaRoutesObserver(
+      LocalMediaRoutesObserver* observer) override;
 
   // These calls invoke methods in the component extension via Mojo.
   void DoCreateRoute(const MediaSource::Id& source_id,
@@ -187,6 +191,14 @@ class MediaRouterMojoImpl : public MediaRouter,
                        mojo::Array<interfaces::MediaSinkPtr> sinks) override;
   void OnRoutesUpdated(mojo::Array<interfaces::MediaRoutePtr> routes) override;
 
+  // Converts the callback result of calling Mojo CreateRoute()/JoinRoute()
+  // into a local callback.
+  void RouteResponseReceived(
+    const std::string& presentation_id,
+    const std::vector<MediaRouteResponseCallback>& callbacks,
+    interfaces::MediaRoutePtr media_route,
+    const mojo::String& error_text);
+
   // Pending requests queued to be executed once component extension
   // becomes ready.
   std::vector<base::Closure> pending_requests_;
@@ -195,6 +207,8 @@ class MediaRouterMojoImpl : public MediaRouter,
                          scoped_ptr<base::ObserverList<MediaSinksObserver>>>
       sinks_observers_;
 
+  base::ObserverList<LocalMediaRoutesObserver> local_routes_observers_;
+
   base::ObserverList<MediaRoutesObserver> routes_observers_;
 
   using PresentationSessionMessagesObserverList =