Add backup element queue to CustomElementReactionStack

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/QualifiedName.h"
+#include "core/dom/custom/CEReactionsScope.h"
 #include "core/dom/custom/CustomElementDefinition.h"
+#include "core/dom/custom/CustomElementReactionStack.h"
 #include "core/dom/custom/CustomElementsRegistry.h"
 #include "core/dom/custom/V0CustomElement.h"
 #include "core/dom/custom/V0CustomElementRegistrationContext.h"
+#include "core/frame/FrameHost.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)
 {
     return registry(element.document());
@@ skipping 129 matching lines @@
         element = toHTMLElement(v0element);
     } else {
         element = HTMLElement::create(tagName, document);
     }
 
     element->setCustomElementState(CustomElementState::Undefined);
 
     return element;
 }
 
+void CustomElement::enqueue(Element* element, CustomElementReaction* reaction)
+{
+    // To enqueue an element on the appropriate element queue
+    // https://html.spec.whatwg.org/multipage/scripting.html#enqueue-an-element-on-the-appropriate-element-queue
+
+    // If the custom element reactions stack is not empty, then
+    // Add element to the current element queue.
+    if (CEReactionsScope* current = CEReactionsScope::current()) {
+        current->enqueueToCurrentQueue(element, reaction);
+        return;
+    }
+
+    // If the custom element reactions stack is empty, then
+    // Add element to the backup element queue.
+    element->document().frameHost()->customElementReactionStack()
+        .enqueueToBackupQueue(element, reaction);
+}
+
 void CustomElement::enqueueConnectedCallback(Element* element)
 {
     DCHECK_EQ(element->getCustomElementState(), CustomElementState::Custom);
     CustomElementDefinition* definition = definitionForElement(*element);
     if (definition->hasConnectedCallback())
         definition->enqueueConnectedCallback(element);
 }
 
 void CustomElement::enqueueDisconnectedCallback(Element* element)
 {
@@ skipping 24 matching lines @@
     CustomElementsRegistry* registry = CustomElement::registry(*element);
     if (!registry)
         return;
     if (CustomElementDefinition* definition = registry->definitionForName(element->localName()))
         definition->enqueueUpgradeReaction(element);
     else
         registry->addCandidate(element);
 }
 
 } // namespace blink