Reland "Sync requestFullscreen() and exitFullscreen() algorithms with the spec"

third_party/WebKit/Source/web/FullscreenController.h

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 42 matching lines @@
   void ExitFullscreen(LocalFrame&);
 
   // Called by content::RenderWidget (via WebWidget) to notify that we've
   // entered or exited fullscreen. This can be because we requested it, or it
   // can be initiated by the browser directly.
   void DidEnterFullscreen();
   void DidExitFullscreen();
 
   // Called by Fullscreen (via ChromeClient) to notify that the fullscreen
   // element has changed.
-  void FullscreenElementChanged(Element*, Element*);
+  void FullscreenElementChanged(Element* from_element, Element* to_element);
 
   bool IsFullscreenOrTransitioning() const { return state_ != State::kInitial; }
 
   void UpdateSize();
 
   void DidUpdateLayout();
 
  protected:
   explicit FullscreenController(WebViewBase*);
 
@@ skipping 23 matching lines @@
   float initial_page_scale_factor_ = 0.0f;
   IntSize initial_scroll_offset_;
   FloatPoint initial_visual_viewport_offset_;
   bool initial_background_color_override_enabled_ = false;
   RGBA32 initial_background_color_override_ = Color::kTransparent;
 };
 
 }  // namespace blink
 
 #endif