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 181 matching lines @@
   void setAttributeNS(const AtomicString& namespace_uri,
                       const AtomicString& qualified_name,
                       const AtomicString& value,
                       ExceptionState&);
 
   const AtomicString& GetIdAttribute() const;
   void SetIdAttribute(const AtomicString&);
 
   const AtomicString& GetNameAttribute() const;
   const AtomicString& GetClassAttribute() const;
+  Vector<AtomicString> getAttributeNames() const;

[tkent, 2017/06/01 23:48:10]

nit: I'd like to move this next to |attributesForBindings()| to synchronize with
the IDL.

[Shanmuga Pandi, 2017/06/02 05:21:51]

Done.

 
   // This is an operation defined in the DOM standard like:
   //   If element is in the HTML namespace and its node document is an HTML
   //   document, then set qualifiedName to qualifiedName in ASCII lowercase.
   //   https://dom.spec.whatwg.org/#concept-element-attributes-get-by-name
   AtomicString LowercaseIfNecessary(const AtomicString&) const;
 
   // NoncedElement implementation: this is only used by HTMLElement and
   // SVGElement, but putting the implementation here allows us to use
   // ElementRareData to hold the data.
@@ skipping 1027 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