Make "document.anchors" return anchors with "id" attribute also

third_party/WebKit/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 123 matching lines @@
     case TRCells:
     case SelectOptions:
     case MapAreas:
         return DoNotInvalidateOnAttributeChanges;
     case DocApplets:
     case SelectedOptions:
     case DataListOptions:
         // FIXME: We can do better some day.
         return InvalidateOnAnyAttrChange;
     case DocAnchors:
-        return InvalidateOnNameAttrChange;
+    case DocumentNamedItems:
+    case WindowNamedItems:
+        return InvalidateOnIdNameAttrChange;
     case DocLinks:
         return InvalidateOnHRefAttrChange;
-    case WindowNamedItems:
-        return InvalidateOnIdNameAttrChange;
-    case DocumentNamedItems:
-        return InvalidateOnIdNameAttrChange;
     case FormControls:
         return InvalidateForFormControls;
     case ClassCollectionType:
         return InvalidateOnClassAttrChange;
     case NameNodeListType:
     case RadioNodeListType:
     case RadioImgNodeListType:
     case LabelsNodeListType:
         break;
     }
@@ skipping 65 matching lines @@
         return toHTMLDataListOptionsCollection(htmlCollection).elementMatches(element);
     case MapAreas:
         return element.hasTagName(areaTag);
     case DocApplets:
         return 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);
+        return element.hasTagName(aTag) && (element.fastHasAttribute(nameAttr) || element.fastHasAttribute(idAttr));
     case ClassCollectionType:
     case TagCollectionType:
     case HTMLTagCollectionType:
     case DocAll:
     case NodeChildren:
     case FormControls:
     case TableRows:
     case WindowNamedItems:
     case NameNodeListType:
     case RadioNodeListType:
@@ skipping 250 matching lines @@
 }
 
 DEFINE_TRACE(HTMLCollection)
 {
     visitor->trace(m_namedItemCache);
     visitor->trace(m_collectionItemsCache);
     LiveNodeListBase::trace(visitor);
 }
 
 } // namespace blink