Force the video to go fullscreen when setting persistent video

content/renderer/media/webmediaplayer_ms_unittest.cc

Index: content/renderer/media/webmediaplayer_ms_unittest.cc
diff --git a/content/renderer/media/webmediaplayer_ms_unittest.cc b/content/renderer/media/webmediaplayer_ms_unittest.cc
index 17d489e6c16ac9b286a64d93d0608d94d3f9d2c4..7b14bd138ed4ffc1df586bc9c38ce2f64c7aacbd 100644
--- a/content/renderer/media/webmediaplayer_ms_unittest.cc
+++ b/content/renderer/media/webmediaplayer_ms_unittest.cc
@@ -456,6 +456,7 @@ class WebMediaPlayerMSTest
   void disconnectedFromRemoteDevice() override {}
   void cancelledRemotePlaybackRequest() override {}
   void remotePlaybackStarted() override {}
+  void onBecamePersistentVideo(bool) override {}
   bool isAutoplayingMuted() override { return false; }
   void requestReload(const blink::WebURL& newUrl) override {}
   bool hasSelectedVideoTrack() override { return false; }