Introduce few const getters for dom classes

third_party/WebKit/Source/core/dom/Element.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003-2011, 2013, 2014 Apple 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
  * License as published by the Free Software Foundation; either
@@ skipping 683 matching lines @@
 
     QualifiedName m_tagName;
 
     void updateNamedItemRegistration(const AtomicString& oldName, const AtomicString& newName);
     void updateExtraNamedItemRegistration(const AtomicString& oldName, const AtomicString& newName);
 
     void createUniqueElementData();
 
     bool shouldInvalidateDistributionWhenAttributeChanged(ElementShadow*, const QualifiedName&, const AtomicString&);
 
+    ElementRareData* maybeElementRareData() const;
     ElementRareData* elementRareData() const;
     ElementRareData& ensureElementRareData();
 
     AttrNodeList& ensureAttrNodeList();
     void removeAttrNodeList();
     void detachAllAttrNodesFromElement();
     void detachAttrNodeFromElementWithValue(Attr*, const AtomicString& value);
     void detachAttrNodeAtIndex(Attr*, size_t index);
 
     v8::Local<v8::Object> wrapCustomElement(v8::Isolate*, v8::Local<v8::Object> creationContext);
@@ skipping 238 matching lines @@
     static T* create(const QualifiedName&, Document&)
 #define DEFINE_ELEMENT_FACTORY_WITH_TAGNAME(T) \
     T* T::create(const QualifiedName& tagName, Document& document) \
     { \
         return new T(tagName, document); \
     }
 
 } // namespace blink
 
 #endif // Element_h