[Media Controls] Prevent flicker when enter/exit fullscreen

third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.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 59 matching lines @@
     MediaControls* Create(HTMLMediaElement&, ShadowRoot&) override;
   };
 
   ~MediaControlsImpl() = default;
 
   // Node override.
   Node::InsertionNotificationRequest InsertedInto(ContainerNode*) override;
   void RemovedFrom(ContainerNode*) override;
 
   // MediaControls implementation.
-  void Show() override;
+  void MaybeShow() override;
   void Hide() override;
   void Reset() override;
   void OnControlsListUpdated() override;
   // TODO(mlamouri): this is temporary to notify the controls that an
   // HTMLTrackElement failed to load because there is no web exposed way to
   // be notified on the TextTrack object. See https://crbug.com/669977
   void OnTrackElementFailedToLoad() override { OnTextTracksAddedOrRemoved(); }
   // Notify us that the media element's network state has changed.
   void NetworkStateChanged() override;
   LayoutObject* PanelLayoutObject() override;
@@ skipping 164 matching lines @@
   IntSize size_;
 
   bool keep_showing_until_timer_fires_ : 1;
 };
 
 DEFINE_ELEMENT_TYPE_CASTS(MediaControlsImpl, IsMediaControls());
 
 }  // namespace blink
 
 #endif