Force the video to go fullscreen when setting persistent video

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 192c94607fc8ff07e093885ee93a49e78f050eeb..1ea5b578aaed8ff192241593c7b9db34bae303d3 100644
--- a/third_party/WebKit/public/platform/WebMediaPlayerClient.h
+++ b/third_party/WebKit/public/platform/WebMediaPlayerClient.h
@@ -95,6 +95,10 @@ class BLINK_PLATFORM_EXPORT WebMediaPlayerClient {
   virtual void cancelledRemotePlaybackRequest() = 0;
   virtual void remotePlaybackStarted() = 0;
 
+  // Set the player as the persistent video. Persistent video should hide its
+  // controls and go fullscreen.
+  virtual void onBecamePersistentVideo(bool) = 0;
+
   // After the monitoring is activated, the client will inform WebMediaPlayer
   // when the element becomes/stops being the dominant visible content by
   // calling WebMediaPlayer::becameDominantVisibleContent(bool).