[Media Controls] Prevent flicker when enter/exit fullscreen

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

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple 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 3669 matching lines @@
     return;
   }
 
   EnsureMediaControls();
   // TODO(mlamouri): this doesn't sound needed but the following tests, on
   // Android fails when removed:
   // fullscreen/compositor-touch-hit-rects-fullscreen-video-controls.html
   GetMediaControls()->Reset();
 
   if (ShouldShowControls(RecordMetricsBehavior::kDoRecord))
-    GetMediaControls()->Show();
+    GetMediaControls()->MaybeShow();
   else
     GetMediaControls()->Hide();
 }
 
 CueTimeline& HTMLMediaElement::GetCueTimeline() {
   if (!cue_timeline_)
     cue_timeline_ = new CueTimeline(*this);
   return *cue_timeline_;
 }
 
@@ skipping 380 matching lines @@
       kMostlyFillViewportBecomeStableSeconds, BLINK_FROM_HERE);
 }
 
 void HTMLMediaElement::ViewportFillDebouncerTimerFired(TimerBase*) {
   mostly_filling_viewport_ = true;
   if (web_media_player_)
     web_media_player_->BecameDominantVisibleContent(mostly_filling_viewport_);
 }
 
 }  // namespace blink