diff -r 000000000000 -r 6474c204b198 dom/webidl/VideoPlaybackQuality.webidl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/webidl/VideoPlaybackQuality.webidl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,21 @@
+/* -*- 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://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.mediasource.enabled"]
+interface VideoPlaybackQuality {
+  readonly attribute DOMHighResTimeStamp creationTime;
+  readonly attribute unsigned long totalVideoFrames;
+  readonly attribute unsigned long droppedVideoFrames;
+  readonly attribute unsigned long corruptedVideoFrames;
+// At Risk: readonly attribute double totalFrameDelay;
+};
+