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diff --git a/dom/chrome-webidl/MediaController.webidl b/dom/chrome-webidl/MediaController.webidl
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+/* 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/.
+ */
+
+/**
+ * This enum lists all supported behaviors on the media controller.
+ */
+enum MediaControlKey {
+  "focus",
+  "play",
+  "pause",
+  "playpause",
+  "previoustrack",
+  "nexttrack",
+  "seekbackward",
+  "seekforward",
+  "skipad",
+  "seekto",
+  "stop",
+};
+
+/**
+ * MediaController is used to control media playback for a tab, and each tab
+ * would only have one media controller, which can be accessed from the
+ * canonical browsing context.
+ */
+[Exposed=Window, ChromeOnly]
+interface MediaController : EventTarget {
+  readonly attribute unsigned long long id;
+  readonly attribute boolean isActive;
+  readonly attribute boolean isAudible;
+  readonly attribute boolean isPlaying;
+  readonly attribute MediaSessionPlaybackState playbackState;
+
+  [Throws]
+  MediaMetadataInit getMetadata();
+
+  [Frozen, Cached, Pure]
+  readonly attribute sequence<MediaControlKey> supportedKeys;
+
+  attribute EventHandler onactivated;
+  attribute EventHandler ondeactivated;
+
+  // Following events would only be dispatched after controller is active.
+  attribute EventHandler onmetadatachange;
+  attribute EventHandler onplaybackstatechange;
+  attribute EventHandler onpositionstatechange;
+  attribute EventHandler onsupportedkeyschange;
+
+  undefined focus();
+  undefined play();
+  undefined pause();
+  undefined stop();
+  undefined prevTrack();
+  undefined nextTrack();
+  undefined seekBackward();
+  undefined seekForward();
+  undefined skipAd();
+  undefined seekTo(double seekTime, optional boolean fastSeek = false);
+};
+
+[ChromeOnly,Exposed=Window,HeaderFile="mozilla/dom/MediaControlService.h"]
+namespace MediaControlService {
+  // This is used to generate fake media control keys event in testing.
+  undefined generateMediaControlKey(MediaControlKey aKey);
+
+  // This is used to get the media metadata from the current main controller in
+  // testing.
+  MediaMetadataInit getCurrentActiveMediaMetadata();
+
+  // This is used to get the actual media playback state from the current main
+  // controller in testing.
+  MediaSessionPlaybackState getCurrentMediaSessionPlaybackState();
+};