diff -r 000000000000 -r 6474c204b198 dom/webidl/MediaStreamTrack.webidl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/webidl/MediaStreamTrack.webidl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,47 @@
+/* -*- 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
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary MediaTrackConstraints : MediaTrackConstraintSet {
+    sequence<DOMString> require;
+    sequence<MediaTrackConstraintSet> advanced;
+
+    // mobile-only backwards-compatibility for facingMode
+    MobileLegacyMediaTrackConstraintSet mandatory;
+    sequence<MobileLegacyMediaTrackConstraintSet> _optional;
+};
+
+// TODO(jib): Remove in 6+ weeks (Bug 997365)
+dictionary MobileLegacyMediaTrackConstraintSet {
+    VideoFacingModeEnum facingMode;
+};
+
+interface MediaStreamTrack {
+    readonly    attribute DOMString             kind;
+    readonly    attribute DOMString             id;
+    readonly    attribute DOMString             label;
+                attribute boolean               enabled;
+//    readonly    attribute MediaStreamTrackState readyState;
+//    readonly    attribute SourceTypeEnum        sourceType;
+//    readonly    attribute DOMString             sourceId;
+//                attribute EventHandler          onstarted;
+//                attribute EventHandler          onmute;
+//                attribute EventHandler          onunmute;
+//                attribute EventHandler          onended;
+//    any                    getConstraint (DOMString constraintName, optional boolean mandatory = false);
+//    void                   setConstraint (DOMString constraintName, any constraintValue, optional boolean mandatory = false);
+//    MediaTrackConstraints? constraints ();
+//    void                   applyConstraints (MediaTrackConstraints constraints);
+//    void                   prependConstraint (DOMString constraintName, any constraintValue);
+//    void                   appendConstraint (DOMString constraintName, any constraintValue);
+//                attribute EventHandler          onoverconstrained;
+//    void                   stop ();
+};