Implement media Cast button in Blink

content/renderer/media/android/webmediaplayer_android.h

Index: content/renderer/media/android/webmediaplayer_android.h
diff --git a/content/renderer/media/android/webmediaplayer_android.h b/content/renderer/media/android/webmediaplayer_android.h
index 1b90148d93adf047724be3a86d9159e1e51ef421..f6e674bcf261ce45e774328fc8131fd08d240f8c 100644
--- a/content/renderer/media/android/webmediaplayer_android.h
+++ b/content/renderer/media/android/webmediaplayer_android.h
@@ -99,6 +99,8 @@ class WebMediaPlayerAndroid : public blink::WebMediaPlayer,
   virtual bool supportsSave() const;
   virtual void setRate(double rate);
   virtual void setVolume(double volume);
+  virtual void requestRemotePlayback();
+  virtual void requestRemotePlaybackControl();
   virtual blink::WebTimeRanges buffered() const;
   virtual double maxTimeSeekable() const;
 
@@ -184,6 +186,7 @@ class WebMediaPlayerAndroid : public blink::WebMediaPlayer,
   void OnMediaPlayerPlay();
   void OnMediaPlayerPause();
   void OnRequestFullscreen();
+  void OnRemoteRouteAvailabilityChanged(bool routes_available);
 
   // Called when the player is released.
   virtual void OnPlayerReleased();