Support subtitles for native fullscreen video

Source/core/rendering/RenderObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 226 matching lines @@
         if (needsLayout())
             showRenderTreeForThis();
         ASSERT_WITH_SECURITY_IMPLICATION(!needsLayout());
     }
 
     void assertSubtreeIsLaidOut() const
     {
         for (const RenderObject* renderer = this; renderer; renderer = renderer->nextInPreOrder())
             renderer->assertRendererLaidOut();
     }
+
+    void setIsCurrentFullscreen(bool flag) { m_isCurrentFullscreen = flag; }
 #endif
 
     // Obtains the nearest enclosing block (including this block) that contributes a first-line style to our inline
     // children.
     virtual RenderBlock* firstLineBlock() const;
 
     // Called when an object that was floating or positioned becomes a normal flow object
     // again.  We have to make sure the render tree updates as needed to accommodate the new
     // normal flow object.
     void handleDynamicFloatPositionChange();
@@ skipping 802 matching lines @@
 
     RenderObject* m_parent;
     RenderObject* m_previous;
     RenderObject* m_next;
 
     static RenderObjectAncestorLineboxDirtySet* s_ancestorLineboxDirtySet;
 
 #ifndef NDEBUG
     unsigned m_hasAXObject             : 1;
     unsigned m_setNeedsLayoutForbidden : 1;
+    unsigned m_isCurrentFullscreen     : 1;
 #endif
 
 #define ADD_BOOLEAN_BITFIELD(name, Name) \
     private:\
         unsigned m_##name : 1;\
     public:\
         bool name() const { return m_##name; }\
         void set##Name(bool name) { m_##name = name; }\
 
     class RenderObjectBitfields {
@@ skipping 299 matching lines @@
 void showTree(const WebCore::RenderObject*);
 void showLineTree(const WebCore::RenderObject*);
 void showRenderTree(const WebCore::RenderObject* object1);
 // We don't make object2 an optional parameter so that showRenderTree
 // can be called from gdb easily.
 void showRenderTree(const WebCore::RenderObject* object1, const WebCore::RenderObject* object2);
 
 #endif
 
 #endif // RenderObject_h