HTML Imports: Fix race conditions on HTMLImportsChild

Source/core/html/imports/HTMLImportChild.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 121 matching lines @@
 }
 
 Document* HTMLImportChild::document() const
 {
     return m_loader ? m_loader->document() : 0;
 }
 
 void HTMLImportChild::stateWillChange()
 {
     toHTMLImportsController(root())->scheduleRecalcState();
+    ensureLoader();
 }
 
 void HTMLImportChild::stateDidChange()
 {
     HTMLImport::stateDidChange();
 
-    ensureLoader();
     if (state().isReady())
         didFinish();
 }
 
 void HTMLImportChild::ensureLoader()
 {
     if (m_loader)
         return;
 
     if (HTMLImportChild* found = toHTMLImportsController(root())->findLinkFor(m_url, this))
@@ skipping 18 matching lines @@
 void HTMLImportChild::shareLoader(HTMLImportChild* loader)
 {
     ASSERT(!m_loader);
     m_loader = loader->m_loader;
     m_loader->addImport(this);
     stateWillChange();
 }
 
 bool HTMLImportChild::isDone() const
 {
-    return m_loader && m_loader->isDone() && !m_customElementMicrotaskStep;
+    return m_loader && m_loader->isDone() && !m_loader->microtaskQueue()->needsProcessOrStop() && !m_customElementMicrotaskStep;
 }
 
 bool HTMLImportChild::loaderHasError() const
 {
     return m_loader && m_loader->hasError();
 }
 
 
 void HTMLImportChild::setClient(HTMLImportChildClient* client)
 {
@@ skipping 22 matching lines @@
     HTMLImport::showThis();
     fprintf(stderr, " loader=%p step=%p sync=%s url=%s",
         m_loader,
         m_customElementMicrotaskStep.get(),
         isSync() ? "Y" : "N",
         url().string().utf8().data());
 }
 #endif
 
 } // namespace WebCore