Upgrade in-document custom elements when an element is defined.

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"
 #include "core/dom/custom/V0CustomElementRegistrationContext.h"
+#include "core/frame/LocalDOMWindow.h"
 #include "core/html/HTMLElement.h"
 #include "platform/text/Character.h"
 #include "wtf/text/AtomicStringHash.h"
 
 namespace blink {
 
+CustomElementsRegistry* CustomElement::registry(const Element& element)
+{
+    if (LocalDOMWindow* window = element.document().domWindow())
+        return window->customElements();
+    return nullptr;
+}
+
 bool CustomElement::isValidName(const AtomicString& name)
 {
     if (!name.length() || name[0] < 'a' || name[0] > 'z')
         return false;
 
     bool hasHyphens = false;
     for (size_t i = 1; i < name.length(); ) {
         UChar32 ch;
         if (name.is8Bit())
             ch = name[i++];
@@ skipping 57 matching lines @@
     } else {
         element = HTMLElement::create(tagName, document);
     }
 
     element->setCustomElementState(CustomElementState::Undefined);
 
     return element;
 }
 
 } // namespace blink