[dom] support iterable<> NodeList

Source/core/dom/NodeList.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2007 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
  * 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 NodeList_h
 #define NodeList_h
 
+#include "bindings/core/v8/Iterable.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "wtf/RefCounted.h"
 
 namespace blink {
 
-class Node;
-
-class CORE_EXPORT NodeList : public RefCountedWillBeGarbageCollectedFinalized<NodeList>, public ScriptWrappable {
+class CORE_EXPORT NodeList : public RefCountedWillBeGarbageCollectedFinalized<NodeList>, public ScriptWrappable, public ValueIterable<Node*> {
     DEFINE_WRAPPERTYPEINFO();
 public:
     virtual ~NodeList() { }
 
     // DOM methods & attributes for NodeList
     virtual unsigned length() const = 0;
     virtual Node* item(unsigned index) const = 0;
 
     // Other methods (not part of DOM)
     virtual bool isEmptyNodeList() const { return false; }
     virtual bool isChildNodeList() const { return false; }
 
     virtual Node* virtualOwnerNode() const { return 0; }
 
     DEFINE_INLINE_VIRTUAL_TRACE() { }
 
 protected:
     NodeList() { }
+
+private:
+    IterationSource* startIteration(ScriptState*, ExceptionState&) override;
 };
 
 } // namespace blink
 
 #endif // NodeList_h