[Media, Video] Enable the video track for a new renderer.

media/blink/webmediaplayer_impl.h

Index: media/blink/webmediaplayer_impl.h
diff --git a/media/blink/webmediaplayer_impl.h b/media/blink/webmediaplayer_impl.h
index 9e0d97c2abd313ee331e6a6cbbdd4132bd35317e..d184aa5115f513f550c8a67cb5b5c34b443ed8c9 100644
--- a/media/blink/webmediaplayer_impl.h
+++ b/media/blink/webmediaplayer_impl.h
@@ -251,6 +251,7 @@ class MEDIA_BLINK_EXPORT WebMediaPlayerImpl
   void DisableOverlay();
 
   void OnPipelineSuspended();
+  void OnPipelineResumed();
   void OnDemuxerOpened();
 
   // Pipeline::Client overrides.
@@ -592,6 +593,9 @@ class MEDIA_BLINK_EXPORT WebMediaPlayerImpl
   // Whether the player is currently in autoplay muted state.
   bool autoplay_muted_ = false;
 
+  // Whether disabled the video track as an optimization.
+  bool video_track_disabled_ = false;
+
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerImpl);
 };