(CANCELED) Add CreateElementFlags::DisableCustomElements

third_party/WebKit/Source/core/dom/custom/CustomElement.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/dom/custom/CustomElement.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/QualifiedName.h"
 #include "core/dom/custom/V0CustomElement.h"
@@ skipping 56 matching lines @@
 {
     return createCustomElement(document,
         QualifiedName(nullAtom, document.convertLocalName(localName), HTMLNames::xhtmlNamespaceURI),
         flags);
 }
 
 HTMLElement* CustomElement::createCustomElement(Document& document, const QualifiedName& tagName, CreateElementFlags flags)
 {
     DCHECK(shouldCreateCustomElement(document, tagName));
 
+    if (flags & DisableCustomElements)
+        return HTMLElement::create(tagName, document);
+
     // TODO(kojii): Look up already defined custom elements when custom element
     // queues and upgrade are implemented.
 
     HTMLElement* element;
     if (V0CustomElement::isValidName(tagName.localName()) && document.registrationContext()) {
         Element* v0element = document.registrationContext()->createCustomTagElement(document, tagName);
         SECURITY_DCHECK(v0element->isHTMLElement());
         element = toHTMLElement(v0element);
     } else {
         element = HTMLElement::create(tagName, document);
     }
 
     element->setCustomElementState(CustomElementState::Undefined);
 
     return element;
 }
 
 } // namespace blink