Add a scoped context object for synchronous CE creation

third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 314 matching lines @@
 }
 
 void LocalDOMWindow::acceptLanguagesChanged()
 {
     if (m_navigator)
         m_navigator->setLanguagesChanged();
 
     dispatchEvent(Event::create(EventTypeNames::languagechange));
 }
 
+void LocalDOMWindow::setCustomElementCreationContext(Document* context)
+{
+    m_customElementCreationContext = context;
+}
+
+Document* LocalDOMWindow::customElementCreationContext() const
+{
+    return m_customElementCreationContext;
+}
+
 Document* LocalDOMWindow::createDocument(const String& mimeType, const DocumentInit& init, bool forceXHTML)
 {
     Document* document = nullptr;
     if (forceXHTML) {
         // This is a hack for XSLTProcessor. See XSLTProcessor::createDocumentFromSource().
         document = Document::create(init);
     } else {
         document = DOMImplementation::createDocument(mimeType, init, init.frame() ? init.frame()->inViewSourceMode() : false);
         if (document->isPluginDocument() && document->isSandboxed(SandboxPlugins))
             document = SinkDocument::create(init);
@@ skipping 1182 matching lines @@
     visitor->trace(m_statusbar);
     visitor->trace(m_toolbar);
     visitor->trace(m_navigator);
     visitor->trace(m_media);
     visitor->trace(m_customElements);
     visitor->trace(m_applicationCache);
     visitor->trace(m_eventQueue);
     visitor->trace(m_postMessageTimers);
     visitor->trace(m_visualViewport);
     visitor->trace(m_eventListenerObservers);
+    visitor->trace(m_customElementCreationContext);
     DOMWindow::trace(visitor);
     Supplementable<LocalDOMWindow>::trace(visitor);
 }
 
 LocalFrame* LocalDOMWindow::frame() const
 {
     // If the LocalDOMWindow still has a frame reference, that frame must point
     // back to this LocalDOMWindow: otherwise, it's easy to get into a situation
     // where script execution leaks between different LocalDOMWindows.
     if (m_frameObserver->frame())
         ASSERT_WITH_SECURITY_IMPLICATION(m_frameObserver->frame()->domWindow() == this);
     return m_frameObserver->frame();
 }
 
 } // namespace blink