Implement media Cast button in Blink

content/renderer/media/android/renderer_media_player_manager.h

Index: content/renderer/media/android/renderer_media_player_manager.h
diff --git a/content/renderer/media/android/renderer_media_player_manager.h b/content/renderer/media/android/renderer_media_player_manager.h
index 4bcb2888378aa73d79f26b3c5e78adafd86fed9c..92034cbc2475ced2c55139549c74fa10f1e0b367 100644
--- a/content/renderer/media/android/renderer_media_player_manager.h
+++ b/content/renderer/media/android/renderer_media_player_manager.h
@@ -72,6 +72,12 @@ class RendererMediaPlayerManager : public RenderFrameObserver {
   // Destroys the player in the browser process
   void DestroyPlayer(int player_id);
 
+  // Requests remote playback if possible
+  void RequestRemotePlayback(int player_id);
+
+  // Requests control of remote playback
+  void RequestRemotePlaybackControl(int player_id);
+
   // Requests the player to enter fullscreen.
   void EnterFullscreen(int player_id, blink::WebFrame* frame);
 
@@ -143,6 +149,7 @@ class RendererMediaPlayerManager : public RenderFrameObserver {
   void OnPlayerPlay(int player_id);
   void OnPlayerPause(int player_id);
   void OnRequestFullscreen(int player_id);
+  void OnRemoteRouteAvailabilityChanged(int player_id, bool routes_available);
   void OnPauseVideo();
 
   // Release all video player resources.