Keep the media controls panel visible if the overflow menu is visible.

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 75 matching lines @@
   // Notify us that the media element's network state has changed.
   void networkStateChanged();
 
   void toggleOverflowMenu();
 
   bool overflowMenuVisible();
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
+  friend class MediaControlsTest;
+
   void invalidate(Element*);
 
   class BatchedControlUpdate;
 
   explicit MediaControls(HTMLMediaElement&);
 
   void initializeControls();
 
   void makeOpaque();
   void makeTransparent();
@@ skipping 58 matching lines @@
   int m_panelWidth;
 
   bool m_allowHiddenVolumeControls : 1;
 };
 
 DEFINE_ELEMENT_TYPE_CASTS(MediaControls, isMediaControls());
 
 }  // namespace blink
 
 #endif