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diff --git a/src/libs/xpcom18a4/xpcom/threads/nsEventQueueUtils.h b/src/libs/xpcom18a4/xpcom/threads/nsEventQueueUtils.h
new file mode 100644
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--- /dev/null
+++ b/src/libs/xpcom18a4/xpcom/threads/nsEventQueueUtils.h
@@ -0,0 +1,78 @@
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 2002
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Darin Fisher <darin@netscape.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef nsEventQueueUtils_h__
+#define nsEventQueueUtils_h__
+
+#include "nsIEventQueueService.h"
+#include "nsIServiceManager.h"
+#include "nsCOMPtr.h"
+
+inline nsresult
+NS_GetEventQueueService(nsIEventQueueService **result)
+{
+  static NS_DEFINE_CID(kEventQueueServiceCID, NS_EVENTQUEUESERVICE_CID);
+  return CallGetService(kEventQueueServiceCID, result);
+}
+
+inline nsresult
+NS_GetCurrentEventQ(nsIEventQueue **result,
+                    nsIEventQueueService *serv = nsnull)
+{
+  nsCOMPtr<nsIEventQueueService> eqs;
+  if (!serv) {
+    nsresult rv = NS_GetEventQueueService(getter_AddRefs(eqs));
+    if (NS_FAILED(rv)) return rv;
+    serv = eqs;
+  }
+  return serv->GetThreadEventQueue(NS_CURRENT_THREAD, result);
+}
+
+inline nsresult
+NS_GetMainEventQ(nsIEventQueue **result,
+                 nsIEventQueueService *serv = nsnull)
+{
+  nsCOMPtr<nsIEventQueueService> eqs;
+  if (!serv) {
+    nsresult rv = NS_GetEventQueueService(getter_AddRefs(eqs));
+    if (NS_FAILED(rv)) return rv;
+    serv = eqs;
+  }
+  return serv->GetThreadEventQueue(NS_UI_THREAD, result);
+}
+
+#endif // !nsEventQueueUtils_h__