Introduce HTMLDataListOptionsCollection subclass for HTMLCollection

Source/core/html/HTMLCollection.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003-2008, 2011, 2012, 2014 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.
@@ skipping 11 matching lines @@
  */
 
 #include "config.h"
 #include "core/html/HTMLCollection.h"
 
 #include "core/HTMLNames.h"
 #include "core/dom/ClassCollection.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/NodeRareData.h"
 #include "core/html/DocumentNameCollection.h"
+#include "core/html/HTMLDataListOptionsCollection.h"
 #include "core/html/HTMLElement.h"
 #include "core/html/HTMLObjectElement.h"
 #include "core/html/HTMLOptionElement.h"
 #include "core/html/HTMLTagCollection.h"
 #include "core/html/WindowNameCollection.h"
 #include "wtf/HashSet.h"
 
 namespace blink {
 
 using namespace HTMLNames;
@@ skipping 172 matching lines @@
         return element.hasTagName(tbodyTag);
     case TRCells:
         return element.hasTagName(tdTag) || element.hasTagName(thTag);
     case TSectionRows:
         return element.hasTagName(trTag);
     case SelectOptions:
         return element.hasTagName(optionTag);
     case SelectedOptions:
         return isHTMLOptionElement(element) && toHTMLOptionElement(element).selected();
     case DataListOptions:
-        if (isHTMLOptionElement(element)) {
-            const HTMLOptionElement& option = toHTMLOptionElement(element);
-            if (!option.isDisabledFormControl() && !option.value().isEmpty())
-                return true;
-        }
-        return false;
+        return toHTMLDataListOptionsCollection(htmlCollection).elementMatches(element);
     case MapAreas:
         return element.hasTagName(areaTag);
     case DocApplets:
         return element.hasTagName(appletTag) || (isHTMLObjectElement(element) && toHTMLObjectElement(element).containsJavaApplet());
     case DocEmbeds:
         return element.hasTagName(embedTag);
     case DocLinks:
         return (element.hasTagName(aTag) || element.hasTagName(areaTag)) && element.fastHasAttribute(hrefAttr);
     case DocAnchors:
         return element.hasTagName(aTag) && element.fastHasAttribute(nameAttr);
@@ skipping 263 matching lines @@
 }
 
 void HTMLCollection::trace(Visitor* visitor)
 {
     visitor->trace(m_namedItemCache);
     visitor->trace(m_collectionIndexCache);
     LiveNodeListBase::trace(visitor);
 }
 
 } // namespace blink