pageshow event does not follow spec

Source/core/frame/DOMWindow.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 436 matching lines @@
 {
     dispatchWindowLoadEvent();
     enqueuePageshowEvent(PageshowEventNotPersisted);
     if (m_pendingStateObject)
         enqueuePopstateEvent(m_pendingStateObject.release());
 }
 
 void DOMWindow::enqueuePageshowEvent(PageshowEventPersistence persisted)
 {
     // FIXME: https://bugs.webkit.org/show_bug.cgi?id=36334 Pageshow event needs to fire asynchronously.
+    // As per spec pageshow must be triggered asynchronously.
+    // However to be compatible with other browsers blink fires pageshow synchronously.
     dispatchEvent(PageTransitionEvent::create(EventTypeNames::pageshow, persisted), m_document.get());
 }
 
 void DOMWindow::enqueueHashchangeEvent(const String& oldURL, const String& newURL)
 {
     enqueueWindowEvent(HashChangeEvent::create(oldURL, newURL));
 }
 
 void DOMWindow::enqueuePopstateEvent(PassRefPtr<SerializedScriptValue> stateObject)
 {
@@ skipping 1436 matching lines @@
     visitor->trace(m_sessionStorage);
     visitor->trace(m_localStorage);
     visitor->trace(m_applicationCache);
     visitor->trace(m_performance);
     visitor->trace(m_css);
     WillBeHeapSupplementable<DOMWindow>::trace(visitor);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace WebCore