Media Controls: don't try to cut the controls when the element is fullscreen.

third_party/WebKit/Source/core/layout/LayoutMedia.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 146 matching lines @@
   else
     view()->unregisterMediaForPositionChangeNotification(*this);
 }
 
 LayoutUnit LayoutMedia::computePanelWidth(const LayoutRect& mediaRect) const {
   // TODO(mlamouri): we don't know if the main frame has an horizontal scrollbar
   // if it is out of process. See https://crbug.com/662480
   if (document().page()->mainFrame()->isRemoteFrame())
     return mediaRect.width();
 
+  // TODO(foolip): when going fullscreen, the animation sometimes does not clear
+  // up properly and the last `absoluteXOffset` received is incorrect. This is
+  // a shortcut that we could ideally avoid. See https://crbug.com/663680
+  if (mediaElement() && mediaElement()->isFullscreen())
+    return mediaRect.width();
+
   FrameHost* frameHost = document().frameHost();
   LocalFrame* mainFrame = document().page()->deprecatedLocalMainFrame();
   FrameView* pageView = mainFrame ? mainFrame->view() : nullptr;
   if (!frameHost || !mainFrame || !pageView)
     return mediaRect.width();
 
   if (pageView->horizontalScrollbarMode() != ScrollbarAlwaysOff)
     return mediaRect.width();
 
   // On desktop, this will include scrollbars when they stay visible.
   const LayoutUnit visibleWidth(frameHost->visualViewport().visibleWidth());
   const LayoutUnit absoluteXOffset(
       localToAbsolute(
           FloatPoint(mediaRect.location()),
           UseTransforms | ApplyContainerFlip | TraverseDocumentBoundaries)
           .x());
   const LayoutUnit newWidth = visibleWidth - absoluteXOffset;
 
   if (newWidth < 0)
     return mediaRect.width();
 
   return std::min(mediaRect.width(), visibleWidth - absoluteXOffset);
 }
 
 }  // namespace blink