diff -r 000000000000 -r 6474c204b198 widget/nsIFormatConverter.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/nsIFormatConverter.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,52 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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"
+#include "nsISupportsArray.idl"
+
+
+[scriptable, uuid(948A0023-E3A7-11d2-96CF-0060B0FB9956)]
+interface nsIFormatConverter : nsISupports
+{  
+  /**
+    * Get the list of the "input" data flavors (mime types as nsISupportsCString),
+    * in otherwords, the flavors that this converter can convert "from" (the 
+    * incoming data to the converter).
+    */
+  nsISupportsArray getInputDataFlavors ( ) ;
+
+  /**
+    * Get the list of the "output" data flavors (mime types as nsISupportsCString),
+    * in otherwords, the flavors that this converter can convert "to" (the 
+    * outgoing data to the converter).
+    *
+    * @param  aDataFlavorList fills list with supported flavors
+    */
+  nsISupportsArray getOutputDataFlavors ( ) ;
+
+  /**
+    * Determines whether a conversion from one flavor to another is supported
+    *
+    * @param  aFromFormatConverter flavor to convert from
+    * @param  aFromFormatConverter flavor to convert to
+    */
+  boolean canConvert ( in string aFromDataFlavor, in string aToDataFlavor ) ;
+
+  /**
+    * Converts from one flavor to another.
+    *
+    * @param  aFromFormatConverter flavor to convert from
+    * @param  aFromFormatConverter flavor to convert to (destination own the memory)
+    * @returns returns NS_OK if it was converted
+    */
+  void convert ( in string aFromDataFlavor, in nsISupports aFromData, in unsigned long aDataLen,
+                   in string aToDataFlavor, out nsISupports aToData, out unsigned long aDataToLen ) ; 
+
+};
+
+
+%{ C++
+
+%}