Make onload async

Source/core/loader/NavigationScheduler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2009 Adam Barth. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
@@ skipping 276 matching lines @@
     //  "If the browsing context's session history contains only one Document,
     //   and that was the about:blank Document created when the browsing context
     //   was created, then the navigation must be done with replacement enabled."
     if (!targetFrame->loader().stateMachine()->committedMultipleRealLoads()
         && equalIgnoringCase(targetFrame->document()->url(), blankURL()))
         return true;
 
     // Navigation of a subframe during loading of an ancestor frame does not create a new back/forward item.
     // The definition of "during load" is any time before all handlers for the load event have been run.
     // See https://bugs.webkit.org/show_bug.cgi?id=14957 for the original motivation for this.
-    Frame* parentFrame = targetFrame->tree().parent();
-    return parentFrame && parentFrame->isLocalFrame() && !toLocalFrame(parentFrame)->loader().allAncestorsAreComplete();
+    for (Frame* parentFrame = targetFrame->tree().parent(); parentFrame; parentFrame = parentFrame->tree().parent()) {
+        if (!parentFrame->isLocalFrame() || !toLocalFrame(parentFrame)->document()->loadEventFinished())
+            return true;
+    }
+    return false;
 }
 
 void NavigationScheduler::scheduleLocationChange(Document* originDocument, const String& url, const Referrer& referrer, bool lockBackForwardList)
 {
     if (!shouldScheduleNavigation(url))
         return;
     if (url.isEmpty())
         return;
 
     lockBackForwardList = lockBackForwardList || mustLockBackForwardList(m_frame);
@@ skipping 112 matching lines @@
 
 void NavigationScheduler::cancel()
 {
     if (m_timer.isActive())
         InspectorInstrumentation::frameClearedScheduledNavigation(m_frame);
     m_timer.stop();
     m_redirect.clear();
 }
 
 } // namespace blink