diff -r 000000000000 -r 6474c204b198 dom/webidl/MediaTrackConstraintSet.webidl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/webidl/MediaTrackConstraintSet.webidl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; 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/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+ */
+
+enum SupportedVideoConstraints {
+    "other",
+    "facingMode",
+    "width",
+    "height",
+    "frameRate",
+};
+
+enum SupportedAudioConstraints {
+    "other"
+};
+
+dictionary MediaTrackConstraintSet {
+    ConstrainLongRange width;
+    ConstrainLongRange height;
+    ConstrainDoubleRange frameRate;
+    ConstrainVideoFacingMode facingMode;
+};
+
+// TODO: Bug 995352 can't nest unions
+//typedef (long or ConstrainLongRange) ConstrainLong;
+//typedef (double or ConstrainDoubleRange) ConstrainDouble;
+
+typedef VideoFacingModeEnum ConstrainVideoFacingMode;
+// TODO: Bug 767924 sequences in unions
+//typedef (VideoFacingModeEnum or sequence<VideoFacingModeEnum>) ConstrainVideoFacingMode;