diff -r 000000000000 -r 6474c204b198 xpcom/components/nsIFactory.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/components/nsIFactory.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,42 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+/**
+ * A class factory allows the creation of nsISupports derived
+ * components without specifying a concrete base class.  
+ */
+
+[scriptable, object, uuid(00000001-0000-0000-c000-000000000046)]
+interface nsIFactory :  nsISupports {
+   /**
+    * Creates an instance of a component.
+    *
+    * @param aOuter Pointer to a component that wishes to be aggregated
+    *               in the resulting instance. This will be nullptr if no
+    *               aggregation is requested.
+    * @param iid    The IID of the interface being requested in
+    *               the component which is being currently created.
+    * @param result [out] Pointer to the newly created instance, if successful.
+    * @throws NS_NOINTERFACE - Interface not accessible.
+    * @throws NS_ERROR_NO_AGGREGATION - if an 'outer' object is supplied, but the
+    *                                   component is not aggregatable.
+    *         NS_ERROR* - Method failure.
+    */
+    void createInstance(in nsISupports aOuter, in nsIIDRef iid,
+                      [retval, iid_is(iid)] out nsQIResult result);
+
+   /**
+    * LockFactory provides the client a way to keep the component
+    * in memory until it is finished with it. The client can call
+    * LockFactory(PR_TRUE) to lock the factory and LockFactory(PR_FALSE)
+    * to release the factory.	 
+    *
+    * @param lock - Must be PR_TRUE or PR_FALSE
+    * @throws NS_ERROR* - Method failure.
+    */
+    void lockFactory(in boolean lock);
+};