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

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

 // Copyright 2017 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_ROUTER_MOJO_MEDIA_ROUTE_CONTROLLER_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_MOJO_MEDIA_ROUTE_CONTROLLER_H_
 
 #include <memory>
 
 #include "base/memory/ref_counted.h"
@@ skipping 58 matching lines @@
 
   // Constructs a MediaRouteController that forwards media commands to
   // |mojo_media_controller|. |media_router| will be notified when the
   // MediaRouteController is destroyed via DetachRouteController().
   MediaRouteController(const MediaRoute::Id& route_id,
                        mojom::MediaControllerPtr mojo_media_controller,
                        MediaRouter* media_router);
 
   // 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.
   void OnMediaStatusUpdated(const MediaStatus& status) override;
 
   // Notifies |observers_| to dispose their references to the controller. The
   // controller gets destroyed when all the references are disposed.
   void Invalidate();
 
   // Returns a mojo pointer bound to |this| by |binding_|. This must only be
   // called at most once in the lifetime of the controller.
   mojom::MediaStatusObserverPtr BindObserverPtr();
 
   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);
 
   // Called when the connection between |this| and the MediaControllerPtr or
   // the MediaStatusObserver binding is no longer valid. Notifies
   // |media_router_| and |observers_| to dispose their references to |this|.
   void OnMojoConnectionError();
 
   // The ID of the Media Route that |this| controls.
   const MediaRoute::Id route_id_;
@@ skipping 13 matching lines @@
 
   // This becomes false when the controller is invalidated.
   bool is_valid_ = true;
 
   DISALLOW_COPY_AND_ASSIGN(MediaRouteController);
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MOJO_MEDIA_ROUTE_CONTROLLER_H_