Implement FullScreen using top layer.

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

 /**
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 236 matching lines @@
 void HTMLPlugInElement::detach(const AttachContext& context)
 {
     // Update the widget the next time we attach (detaching destroys the plugin).
     // FIXME: None of this "needsWidgetUpdate" related code looks right.
     if (layoutObject() && !useFallbackContent())
         setNeedsWidgetUpdate(true);
     if (m_isDelayingLoadEvent) {
         m_isDelayingLoadEvent = false;
         document().decrementLoadEventDelayCount();
     }
-

[Julien - ping for review, 2015/10/01 00:24:40]

Empty line removal? Unneeded churn?

[dsinclair, 2015/10/01 14:50:14]

Leftover from debugging. Fixed.

     // Only try to persist a plugin widget we actually own.
     Widget* plugin = ownedWidget();
     if (plugin && context.performingReattach)
         setPersistedPluginWidget(plugin);
 
     resetInstance();
     // Clear the widget; will trigger disposal of it with Oilpan.
     setWidget(nullptr);
 
     if (m_NPObject) {
@@ skipping 367 matching lines @@
     return openShadowRoot();
 }
 
 void HTMLPlugInElement::lazyReattachIfNeeded()
 {
     if (!useFallbackContent() && needsWidgetUpdate() && layoutObject() && !isImageType())
         lazyReattachIfAttached();
 }
 
 }