Add "Failed" custom element state

third_party/WebKit/Source/bindings/core/v8/ScriptCustomElementDefinition.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 "bindings/core/v8/ScriptCustomElementDefinition.h"
 
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8BindingMacros.h"
 #include "bindings/core/v8/V8CustomElementsRegistry.h"
 #include "bindings/core/v8/V8Element.h"
 #include "bindings/core/v8/V8HiddenValue.h"
 #include "bindings/core/v8/V8ScriptRunner.h"
 #include "bindings/core/v8/V8ThrowException.h"
 #include "core/dom/ExceptionCode.h"
+#include "core/dom/custom/CustomElement.h"
 #include "core/html/HTMLElement.h"
-#include "core/html/HTMLUnknownElement.h"
 #include "v8.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 // Retrieves the custom elements constructor -> name map, creating it
 // if necessary. The same map is used to keep prototypes alive.
 static v8::Local<v8::Map> ensureCustomElementsRegistryMap(
     ScriptState* scriptState,
     CustomElementsRegistry* registry)
@@ skipping 170 matching lines @@
     HTMLElement* element = createElementSync(document, tagName, exceptionState);
 
     if (exceptionState.hadException() || !element) {
         // 7. If this step throws an exception, then report the exception, ...
         {
             v8::TryCatch tryCatch(isolate);
             tryCatch.SetVerbose(true);
             exceptionState.throwIfNeeded();
         }
 
-        // ...and let element be instead a new element that implements
-        // HTMLUnknownElement, with no attributes, namespace set to given
-        // namespace, namespace prefix set to null, custom element state
-        // "undefined", and node document set to document.
-        element = HTMLUnknownElement::create(tagName, document);
-        element->setCustomElementState(CustomElementState::Undefined);
+        return CustomElement::createFailedElement(document, tagName);
     }
     return element;
 }
 
 // https://html.spec.whatwg.org/multipage/scripting.html#upgrades
 bool ScriptCustomElementDefinition::runConstructor(Element* element)
 {
     if (!m_scriptState->contextIsValid())
         return false;
     ScriptState::Scope scope(m_scriptState.get());
@@ skipping 123 matching lines @@
         v8String(isolate, name.localName()),
         v8StringOrNull(isolate, oldValue),
         v8StringOrNull(isolate, newValue),
         v8String(isolate, name.namespaceURI()),
     };
     runCallback(m_attributeChangedCallback.newLocal(isolate), element,
         argc, argv);
 }
 
 } // namespace blink