Creating custom element should not be case sensitive

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 762 matching lines @@
 PassRefPtrWillBeRawPtr<Element> Document::createElement(const AtomicString& localName, const AtomicString& typeExtension, ExceptionState& exceptionState)
 {
     if (!isValidName(localName)) {
         exceptionState.throwDOMException(InvalidCharacterError, "The tag name provided ('" + localName + "') is not a valid name.");
         return nullptr;
     }
 
     RefPtrWillBeRawPtr<Element> element;
 
     if (CustomElement::isValidName(localName) && registrationContext()) {
-        element = registrationContext()->createCustomTagElement(*this, QualifiedName(nullAtom, localName, xhtmlNamespaceURI));
+        element = registrationContext()->createCustomTagElement(*this, QualifiedName(nullAtom, isHTMLDocument() ? localName.lower() : localName, xhtmlNamespaceURI));

[dominicc (has gone to gerrit), 2014/08/11 06:05:27]

Could we factor out a little function and eliminate the duplication with line
768?

[deepak.sa, 2014/08/11 10:32:50]

Done.

     } else {
         element = createElement(localName, exceptionState);
         if (exceptionState.hadException())
             return nullptr;
     }
 
     if (!typeExtension.isEmpty())
         CustomElementRegistrationContext::setIsAttributeAndTypeExtension(element.get(), typeExtension);
 
     return element.release();
@@ skipping 5098 matching lines @@
 using namespace blink;
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (WeakDocumentSet::const_iterator it = set.begin(); it != set.end(); ++it) {
         fprintf(stderr, "- Document %p URL: %s\n", *it, (*it)->url().string().utf8().data());
     }
 }
 #endif