Add support for Element.getAttributeNames()

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 350 matching lines @@
   const StylePropertySet* PresentationAttributeStyle();
   virtual bool IsPresentationAttribute(const QualifiedName&) const {
     return false;
   }
   virtual void CollectStyleForPresentationAttribute(const QualifiedName&,
                                                     const AtomicString&,
                                                     MutableStylePropertySet*) {}
 
   // For exposing to DOM only.
   NamedNodeMap* attributesForBindings() const;
+  Vector<AtomicString> getAttributeNames() const;
 
   enum class AttributeModificationReason { kDirectly, kByParser, kByCloning };
   struct AttributeModificationParams {
     STACK_ALLOCATED();
     AttributeModificationParams(const QualifiedName& qname,
                                 const AtomicString& old_value,
                                 const AtomicString& new_value,
                                 AttributeModificationReason reason)
         : name(qname),
           old_value(old_value),
@@ skipping 858 matching lines @@
 #define DECLARE_ELEMENT_FACTORY_WITH_TAGNAME(T) \
   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