Add "Failed" custom element state

third_party/WebKit/Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1897 matching lines @@
     if (!layoutObject)
         return;
     if (!layoutObject->hasLayer())
         return;
     layoutObject->layer()->setNeedsCompositingInputsUpdate();
     // Changes in the return value of requiresAcceleratedCompositing change if
     // the PaintLayer is self-painting.
     layoutObject->layer()->updateSelfPaintingLayer();
 }
 
+bool Element::isDefined() const
+{
+    return CustomElement::isDefined(getCustomElementState());

[dominicc (has gone to gerrit), 2016/07/26 05:47:42]

Do we need CustomElement::isDefined and Element::isDefined? Is there any place
where we're *just* testing a state and not an element's state?

+}
+
 void Element::setCustomElementDefinition(V0CustomElementDefinition* definition)
 {
     if (!hasRareData() && !definition)
         return;
     DCHECK(!customElementDefinition());
     ensureElementRareData().setCustomElementDefinition(definition);
 }
 
 V0CustomElementDefinition* Element::customElementDefinition() const
 {
@@ skipping 24 matching lines @@
 }
 
 ShadowRoot* Element::attachShadow(const ScriptState* scriptState, const ShadowRootInit& shadowRootInitDict, ExceptionState& exceptionState)
 {
     DCHECK(RuntimeEnabledFeatures::shadowDOMV1Enabled());
 
     HostsUsingFeatures::countMainWorldOnly(scriptState, document(), HostsUsingFeatures::Feature::ElementAttachShadow);
 
     const AtomicString& tagName = localName();
     bool tagNameIsSupported = isV0CustomElement()
-        || isCustomElement()
+        || getCustomElementState() != CustomElementState::Uncustomized
         || tagName == HTMLNames::articleTag
         || tagName == HTMLNames::asideTag
         || tagName == HTMLNames::blockquoteTag
         || tagName == HTMLNames::bodyTag
         || tagName == HTMLNames::divTag
         || tagName == HTMLNames::footerTag
         || tagName == HTMLNames::h1Tag
         || tagName == HTMLNames::h2Tag
         || tagName == HTMLNames::h3Tag
         || tagName == HTMLNames::h4Tag
@@ skipping 1772 matching lines @@
 
 DEFINE_TRACE_WRAPPERS(Element)
 {
     if (hasRareData()) {
         visitor->traceWrappers(elementRareData());
     }
     ContainerNode::traceWrappers(visitor);
 }
 
 } // namespace blink