Add a test that we resume commits after inserting the body.

Source/web/ChromeClientImpl.cpp

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 971 matching lines @@
     m_popupOpeningObservers.remove(index);
 }
 
 void ChromeClientImpl::notifyPopupOpeningObservers() const
 {
     const Vector<PopupOpeningObserver*> observers(m_popupOpeningObservers);
     for (const auto& observer : observers)
         observer->willOpenPopup();
 }
 
+bool ChromeClientImpl::disableThreadedParsingForUnitTests() const
+{
+    return m_webView->client() && m_webView->client()->disableThreadedParsingForUnitTests();
+}
+
 FloatSize ChromeClientImpl::elasticOverscroll() const
 {
     return m_webView->elasticOverscroll();
 }
 
 } // namespace blink