Media Controls: don't activate buttons when tapping on hidden controls.

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

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 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.
@@ skipping 27 matching lines @@
 class TextTrack;
 
 // ----------------------------
 
 class MediaControlPanelElement final : public MediaControlDivElement {
  public:
   static MediaControlPanelElement* create(MediaControls&);
 
   void setIsDisplayed(bool);
 
+  bool isOpaque() const;
   void makeOpaque();
   void makeTransparent();
 
  private:
   explicit MediaControlPanelElement(MediaControls&);
 
   void defaultEventHandler(Event*) override;
   bool keepEventInNode(Event*) override;
 
   void startTimer();
@@ skipping 308 matching lines @@
  public:
   static MediaControlCurrentTimeDisplayElement* create(MediaControls&);
 
  private:
   explicit MediaControlCurrentTimeDisplayElement(MediaControls&);
 };
 
 }  // namespace blink
 
 #endif  // MediaControlElements_h