diff -r 000000000000 -r 6474c204b198 dom/smil/nsSMILTypes.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/smil/nsSMILTypes.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,25 @@
+/* -*- 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/. */
+
+#ifndef NS_SMILTYPES_H_
+#define NS_SMILTYPES_H_
+
+#include <stdint.h>
+
+// A timestamp in milliseconds
+//
+// A time may represent:
+//
+//   simple time -- offset within the simple duration
+//   active time -- offset within the active duration
+//   document time -- offset since the document begin
+//   wallclock time -- "real" time -- offset since the epoch
+//
+// For an overview of how this class is related to other SMIL time classes see
+// the documentstation in nsSMILTimeValue.h
+//
+typedef int64_t nsSMILTime;
+
+#endif // NS_SMILTYPES_H_