Disable background video track behind a feature flag

third_party/WebKit/public/platform/WebMediaPlayerClient.h

Index: third_party/WebKit/public/platform/WebMediaPlayerClient.h
diff --git a/third_party/WebKit/public/platform/WebMediaPlayerClient.h b/third_party/WebKit/public/platform/WebMediaPlayerClient.h
index f9e4dbdf05ee58fdea2d6dbeba99a83259b077cb..cb9807e61d05415ebb15cea35f0ac151335c4ce9 100644
--- a/third_party/WebKit/public/platform/WebMediaPlayerClient.h
+++ b/third_party/WebKit/public/platform/WebMediaPlayerClient.h
@@ -101,6 +101,12 @@ class BLINK_PLATFORM_EXPORT WebMediaPlayerClient {
   // Warning: This method will destruct the caller.
   virtual void requestReload(const WebURL& newUrl) = 0;
 
+  // Returns if there's a selected video track.
+  virtual bool hasSelectedVideoTrack() = 0;
+
+  // Returns the selected video track id (or an empty id if there's none).
+  virtual WebMediaPlayer::TrackId getSelectedVideoTrackId() = 0;
+
  protected:
   ~WebMediaPlayerClient() {}
 };