diff -r 000000000000 -r 6474c204b198 dom/mobilemessage/interfaces/nsIDOMSmsSegmentInfo.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/mobilemessage/interfaces/nsIDOMSmsSegmentInfo.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+/* 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"
+
+[scriptable, builtinclass, uuid(57ac3989-531e-4928-998b-53fde81a05a6)]
+interface nsIDOMMozSmsSegmentInfo : nsISupports
+{
+  /* The number of total segments for the input string. */
+  readonly attribute long segments;
+  /* The number of characters available per segment. */
+  readonly attribute long charsPerSegment;
+  /* The maximum number of available characters in the last segment. */
+  readonly attribute long charsAvailableInLastSegment;
+};