[dom] support iterable<> NodeList

Source/core/html/HTMLCollection.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Samsung Electronics. 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef HTMLCollection_h
 #define HTMLCollection_h
 
+#include "bindings/core/v8/Iterable.h"
 #include "core/CoreExport.h"
 #include "core/dom/LiveNodeListBase.h"
 #include "core/html/CollectionItemsCache.h"
 #include "core/html/CollectionType.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
-class CORE_EXPORT HTMLCollection : public RefCountedWillBeGarbageCollectedFinalized<HTMLCollection>, public ScriptWrappable, public LiveNodeListBase {
+class CORE_EXPORT HTMLCollection : public RefCountedWillBeGarbageCollectedFinalized<HTMLCollection>, public ScriptWrappable, public ValueIterable<Element*>, public LiveNodeListBase {
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(HTMLCollection);
 public:
     enum ItemAfterOverrideType {
         OverridesItemAfter,
         DoesNotOverrideItemAfter,
     };
 
     static PassRefPtrWillBeRawPtr<HTMLCollection> create(ContainerNode& base, CollectionType);
     virtual ~HTMLCollection();
@@ skipping 94 matching lines @@
 
         m_namedItemCache.clear();
     }
 
     void unregisterIdNameCacheFromDocument(Document& document) const
     {
         ASSERT(hasValidIdNameCache());
         document.unregisterNodeListWithIdNameCache(this);
     }
 
+    IterationSource* startIteration(ScriptState*, ExceptionState&) override;
+
     const unsigned m_overridesItemAfter : 1;
     const unsigned m_shouldOnlyIncludeDirectChildren : 1;
     mutable OwnPtrWillBeMember<NamedItemCache> m_namedItemCache;
     mutable CollectionItemsCache<HTMLCollection, Element> m_collectionItemsCache;
 };
 
 DEFINE_TYPE_CASTS(HTMLCollection, LiveNodeListBase, collection, isHTMLCollectionType(collection->type()), isHTMLCollectionType(collection.type()));
 
 inline void HTMLCollection::invalidateCacheForAttribute(const QualifiedName* attrName) const
 {
     if (!attrName || shouldInvalidateTypeOnAttributeChange(invalidationType(), *attrName))
         invalidateCache();
     else if (*attrName == HTMLNames::idAttr || *attrName == HTMLNames::nameAttr)
         invalidateIdNameCacheMaps();
 }
 
 } // namespace blink
 
 #endif // HTMLCollection_h