[RemotePlayback] Implement 'connecting' state

chrome/browser/media/android/remote/remote_media_player_manager.h

 // Copyright 2013 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_REMOTE_REMOTE_MEDIA_PLAYER_MANAGER_H_
 #define CHROME_BROWSER_MEDIA_ANDROID_REMOTE_REMOTE_MEDIA_PLAYER_MANAGER_H_
 
 #include <memory>
 #include <set>
 #include <unordered_map>
@@ skipping 16 matching lines @@
   explicit RemoteMediaPlayerManager(
       content::RenderFrameHost* render_frame_host);
   ~RemoteMediaPlayerManager() override;
 
   void OnPlaying(int player_id);
   void OnPaused(int player_id);
 
   // Callback to trigger when a remote device has been unselected.
   void OnRemoteDeviceUnselected(int player_id);
 
+  // Callback to trigger when the video on a remote device starts playing.
+  void OnRemotePlaybackStarted(int player_id);
+
   // Callback to trigger when the video on a remote device finishes playing.
   void OnRemotePlaybackFinished(int player_id);
 
   // Callback to trigger when the availability of remote routes changes.
   void OnRouteAvailabilityChanged(int tab_id, bool routes_available);
 
   // Callback to trigger when the device picker dialog was dismissed.
   void OnCancelledRemotePlaybackRequest(int player_id);
 
   void OnMediaMetadataChanged(int player_id,
@@ skipping 71 matching lines @@
   std::unordered_map<int, GURL> poster_urls_;
 
   base::WeakPtrFactory<RemoteMediaPlayerManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteMediaPlayerManager);
 };
 
 } // namespace remote_media
 
 #endif  // CHROME_BROWSER_MEDIA_ANDROID_REMOTE_REMOTE_MEDIA_PLAYER_MANAGER_H_