Force the video to go fullscreen when setting persistent video

third_party/WebKit/Source/core/html/HTMLMediaElement.h

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.h
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.h b/third_party/WebKit/Source/core/html/HTMLMediaElement.h
index 3d4b4c86ee81d18bde363883fbdb2364ab1a3b23..6f86d8aab039263f8af8aa14969fbea0dea10906 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.h
@@ -401,6 +401,7 @@ class CORE_EXPORT HTMLMediaElement
   void disconnectedFromRemoteDevice() final;
   void cancelledRemotePlaybackRequest() final;
   void remotePlaybackStarted() final;
+  void onBecamePersistentVideo(bool) final;
   bool hasSelectedVideoTrack() final;
   WebMediaPlayer::TrackId getSelectedVideoTrackId() final;
   bool isAutoplayingMuted() final;
@@ -740,6 +741,7 @@ class CORE_EXPORT HTMLMediaElement
   friend class MediaControlsTest;
   friend class HTMLMediaElementTest;
   friend class HTMLMediaElementEventListenersTest;
+  friend class HTMLMediaElementPersistentVideoTest;
   friend class HTMLVideoElement;
   friend class HTMLVideoElementTest;
   friend class MediaControlsOrientationLockDelegateTest;
@@ -756,6 +758,8 @@ class CORE_EXPORT HTMLMediaElement
   Member<MediaControls> m_mediaControls;
   Member<HTMLMediaElementControlsList> m_controlsList;
 
+  bool m_isPersistentVideo;
+
   static URLRegistry* s_mediaStreamRegistry;
 };