Reland [Media Router] Custom Controls 3 - add plumbing through MRUI and MRWebUIMessageHandler

chrome/browser/media/router/mojo/media_route_controller.h

Index: chrome/browser/media/router/mojo/media_route_controller.h
diff --git a/chrome/browser/media/router/mojo/media_route_controller.h b/chrome/browser/media/router/mojo/media_route_controller.h
index 3d92a4be6f1d15e5ae5250ffd46059f5abfdb5e2..5a5fab0bc132e11c94d9715cc02d71e9f550a224 100644
--- a/chrome/browser/media/router/mojo/media_route_controller.h
+++ b/chrome/browser/media/router/mojo/media_route_controller.h
@@ -76,11 +76,11 @@ class MediaRouteController : public mojom::MediaStatusObserver,
 
   // Media controller methods for forwarding commands to a
   // mojom::MediaControllerPtr held in |mojo_media_controller_|.
-  void Play();
-  void Pause();
-  void Seek(base::TimeDelta time);
-  void SetMute(bool mute);
-  void SetVolume(float volume);
+  virtual void Play() const;
+  virtual void Pause() const;
+  virtual void Seek(base::TimeDelta time) const;
+  virtual void SetMute(bool mute) const;
+  virtual void SetVolume(float volume) const;
 
   // mojom::MediaStatusObserver:
   // Notifies |observers_| of a status update.
@@ -96,11 +96,12 @@ class MediaRouteController : public mojom::MediaStatusObserver,
 
   MediaRoute::Id route_id() const { return route_id_; }
 
+ protected:
+  ~MediaRouteController() override;
+
  private:
   friend class base::RefCounted<MediaRouteController>;
 
-  ~MediaRouteController() override;
-
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);