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diff --git a/dom/webidl/MediaStreamTrack.webidl b/dom/webidl/MediaStreamTrack.webidl
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+++ b/dom/webidl/MediaStreamTrack.webidl
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+/* -*- 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.
+ */
+
+// These two enums are in the spec even though they're not used directly in the
+// API due to https://www.w3.org/Bugs/Public/show_bug.cgi?id=19936
+// Their binding code is used in the implementation.
+
+enum VideoFacingModeEnum {
+    "user",
+    "environment",
+    "left",
+    "right"
+};
+
+enum MediaSourceEnum {
+    "camera",
+    "screen",
+    "application",
+    "window",
+    "browser",
+    "microphone",
+    "audioCapture",
+    "other"
+    // If values are added, adjust n_values in Histograms.json (2 places)
+};
+
+dictionary ConstrainLongRange {
+    long min;
+    long max;
+    long exact;
+    long ideal;
+};
+
+dictionary ConstrainDoubleRange {
+    double min;
+    double max;
+    double exact;
+    double ideal;
+};
+
+dictionary ConstrainBooleanParameters {
+    boolean exact;
+    boolean ideal;
+};
+
+dictionary ConstrainDOMStringParameters {
+    (DOMString or sequence<DOMString>) exact;
+    (DOMString or sequence<DOMString>) ideal;
+};
+
+typedef (long or ConstrainLongRange) ConstrainLong;
+typedef (double or ConstrainDoubleRange) ConstrainDouble;
+typedef (boolean or ConstrainBooleanParameters) ConstrainBoolean;
+typedef (DOMString or sequence<DOMString> or ConstrainDOMStringParameters) ConstrainDOMString;
+
+// Note: When adding new constraints, remember to update the SelectSettings()
+// function in MediaManager.cpp to make OverconstrainedError's constraint work!
+
+dictionary MediaTrackConstraintSet {
+    ConstrainLong width;
+    ConstrainLong height;
+    ConstrainDouble frameRate;
+    ConstrainDOMString facingMode;
+    DOMString mediaSource;
+    long long browserWindow;
+    boolean scrollWithPage;
+    ConstrainDOMString deviceId;
+    ConstrainDOMString groupId;
+    ConstrainLong viewportOffsetX;
+    ConstrainLong viewportOffsetY;
+    ConstrainLong viewportWidth;
+    ConstrainLong viewportHeight;
+    ConstrainBoolean echoCancellation;
+    ConstrainBoolean noiseSuppression;
+    ConstrainBoolean autoGainControl;
+    ConstrainLong channelCount;
+};
+
+[GenerateToJSON]
+dictionary MediaTrackConstraints : MediaTrackConstraintSet {
+    sequence<MediaTrackConstraintSet> advanced;
+};
+
+enum MediaStreamTrackState {
+    "live",
+    "ended"
+};
+
+[Exposed=Window]
+interface MediaStreamTrack : EventTarget {
+    readonly    attribute DOMString             kind;
+    readonly    attribute DOMString             id;
+    [NeedsCallerType]
+    readonly    attribute DOMString             label;
+                attribute boolean               enabled;
+    readonly    attribute boolean               muted;
+                attribute EventHandler          onmute;
+                attribute EventHandler          onunmute;
+    readonly    attribute MediaStreamTrackState readyState;
+                attribute EventHandler          onended;
+    MediaStreamTrack       clone ();
+    undefined              stop ();
+//  MediaTrackCapabilities getCapabilities ();
+    MediaTrackConstraints  getConstraints ();
+    [NeedsCallerType]
+    MediaTrackSettings     getSettings ();
+
+    [NewObject, NeedsCallerType]
+    Promise<undefined>     applyConstraints (optional MediaTrackConstraints constraints = {});
+//              attribute EventHandler          onoverconstrained;
+};