diff -r 000000000000 -r 6474c204b198 xpcom/io/nsISimpleUnicharStreamFactory.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/io/nsISimpleUnicharStreamFactory.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+/* 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"
+
+interface nsIInputStream;
+interface nsIUnicharInputStream;
+
+/**
+ * Factory to create objects that implement nsIUnicharInputStream,
+ * converting from a unicode string or a UTF-8 stream.
+ */
+[scriptable, uuid(8238cd2e-e8e3-43e8-b556-56e21389c766)]
+interface nsISimpleUnicharStreamFactory : nsISupports
+{
+  /**
+   * Create a unicode input stream from a unicode string.
+   */
+  nsIUnicharInputStream createInstanceFromString(in AString aString);
+
+  /**
+   * Create a unicode stream from an input stream in UTF8.
+   */
+  nsIUnicharInputStream createInstanceFromUTF8Stream(in nsIInputStream aStream);
+};