Don't show media controls when there is a persistent video.

third_party/WebKit/Source/core/html/shadow/MediaControls.h

 /*
  * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 92 matching lines @@
   void onRemotePlaybackAvailabilityChanged() { refreshCastButtonVisibility(); }
   void onRemotePlaybackConnecting() { startedCasting(); }
   void onRemotePlaybackDisconnected() { stoppedCasting(); }
 
   // TODO(mlamouri): this method is needed in order to notify the controls that
   // the attribute have changed.
   void onDisableRemotePlaybackAttributeChanged() {
     refreshCastButtonVisibility();
   }
 
+  // TODO(mlamouri): this method is needed in order to notify the controls that
+  // the `mediaControlsEnabled` setting has changed.
+  void onMediaControlsEnabledChange() {
+    // There is no update because only the overlay is expected to change.
+    refreshCastButtonVisibilityWithoutUpdate();
+  }
+
   DECLARE_VIRTUAL_TRACE();
 
  private:
   friend class MediaControlsMediaEventListener;
   friend class MediaControlsOrientationLockDelegateTest;
   friend class MediaControlsTest;
 
   void invalidate(Element*);
 
   class BatchedControlUpdate;
@@ skipping 91 matching lines @@
   int m_panelWidth;
 
   bool m_keepShowingUntilTimerFires : 1;
 };
 
 DEFINE_ELEMENT_TYPE_CASTS(MediaControls, isMediaControls());
 
 }  // namespace blink
 
 #endif