Support subtitles for native fullscreen video

Source/core/dom/FullscreenElementStack.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
@@ skipping 349 matching lines @@
     if (!document()->page())
         return;
 
     ASSERT(document()->page()->settings().fullScreenEnabled());
 
     if (m_fullScreenRenderer)
         m_fullScreenRenderer->unwrapRenderer();
 
     m_fullScreenElement = element;
 
-#if USE(NATIVE_FULLSCREEN_VIDEO)
-    if (element && element->isMediaElement())
-        return;
-#endif
-
     // Create a placeholder block for a the full-screen element, to keep the page from reflowing
     // when the element is removed from the normal flow. Only do this for a RenderBox, as only
     // a box will have a frameRect. The placeholder will be created in setFullScreenRenderer()
     // during layout.
     RenderObject* renderer = m_fullScreenElement->renderer();
     bool shouldCreatePlaceholder = renderer && renderer->isBox();
     if (shouldCreatePlaceholder) {
         m_savedPlaceholderFrameRect = toRenderBox(renderer)->frameRect();
         m_savedPlaceholderRenderStyle = RenderStyle::clone(renderer->style());
     }
@@ skipping 174 matching lines @@
         if (!target)
             target = fullscreen->webkitCurrentFullScreenElement();
     }
 
     if (!target)
         target = doc;
     m_fullScreenChangeEventTargetQueue.append(target);
 }
 
 } // namespace WebCore