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

chrome/browser/media/android/router/media_router_android.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_MEDIA_ANDROID_ROUTER_MEDIA_ROUTER_ANDROID_H_
 #define CHROME_BROWSER_MEDIA_ANDROID_ROUTER_MEDIA_ROUTER_ANDROID_H_
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
@@ skipping 83 matching lines @@
   void RegisterMediaSinksObserver(MediaSinksObserver* observer) override;
   void UnregisterMediaSinksObserver(MediaSinksObserver* observer) override;
   void RegisterMediaRoutesObserver(MediaRoutesObserver* observer) override;
   void UnregisterMediaRoutesObserver(MediaRoutesObserver* observer) override;
   void RegisterIssuesObserver(IssuesObserver* observer) override;
   void UnregisterIssuesObserver(IssuesObserver* observer) override;
   void RegisterPresentationSessionMessagesObserver(
       PresentationSessionMessagesObserver* observer) override;
   void UnregisterPresentationSessionMessagesObserver(
       PresentationSessionMessagesObserver* observer) override;
+  void RegisterLocalMediaRoutesObserver(
+      LocalMediaRoutesObserver* observer) override;
+  void UnregisterLocalMediaRoutesObserver(
+      LocalMediaRoutesObserver* observer) override;
 
   base::android::ScopedJavaGlobalRef<jobject> java_media_router_;
 
   using MediaSinkObservers = base::ScopedPtrHashMap<
       MediaSource::Id,
       scoped_ptr<base::ObserverList<MediaSinksObserver>>>;
   MediaSinkObservers sinks_observers_;
 
   base::ObserverList<MediaRoutesObserver> routes_observers_;
 
@@ skipping 25 matching lines @@
       MediaRoute::Id,
       scoped_ptr<base::ObserverList<PresentationSessionMessagesObserver>>>;
   MessagesObservers messages_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaRouterAndroid);
 };
 
 } // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ANDROID_ROUTER_MEDIA_ROUTER_ANDROID_H_