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diff --git a/dom/canvas/test/webgl-conf/checkout/deqp/temp_externs/mediasource.js b/dom/canvas/test/webgl-conf/checkout/deqp/temp_externs/mediasource.js
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+/*
+ * Copyright 2012 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * @fileoverview Definitions for the Media Source Extensions. Note that the
+ * properties available here are the union of several versions of the spec.
+ * @see http://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html
+ *
+ * @externs
+ */
+
+/**
+ * @constructor
+ * @implements {EventTarget}
+ */
+function MediaSource() {}
+
+/**
+ * @param {boolean=} opt_useCapture
+ * @override
+ */
+MediaSource.prototype.addEventListener = function(
+    type, listener, opt_useCapture) {};
+
+/**
+ * @param {boolean=} opt_useCapture
+ * @override
+ */
+MediaSource.prototype.removeEventListener = function(
+    type, listener, opt_useCapture) {};
+
+/** @override */
+MediaSource.prototype.dispatchEvent = function(evt) {};
+
+/** @type {Array.<SourceBuffer>} */
+MediaSource.prototype.sourceBuffers;
+
+/** @type {Array.<SourceBuffer>} */
+MediaSource.prototype.activeSourceBuffers;
+
+/** @type {number} */
+MediaSource.prototype.duration;
+
+/**
+ * @param {string} type
+ * @return {SourceBuffer}
+ */
+MediaSource.prototype.addSourceBuffer = function(type) {};
+
+/**
+ * @param {SourceBuffer} sourceBuffer
+ */
+MediaSource.prototype.removeSourceBuffer = function(sourceBuffer) {};
+
+/** @type {string} */
+MediaSource.prototype.readyState;
+
+/**
+ * @param {string=} opt_error
+ */
+MediaSource.prototype.endOfStream = function(opt_error) {};
+
+/**
+ * @param {string} type
+ * @return {boolean}
+ */
+MediaSource.isTypeSupported = function(type) {};
+
+
+/**
+ * @constructor
+ * @implements {EventTarget}
+ */
+function SourceBuffer() {}
+
+/**
+ * @param {boolean=} opt_useCapture
+ * @override
+ */
+SourceBuffer.prototype.addEventListener = function(
+    type, listener, opt_useCapture) {};
+
+/**
+ * @param {boolean=} opt_useCapture
+ * @override
+ */
+SourceBuffer.prototype.removeEventListener = function(
+    type, listener, opt_useCapture) {};
+
+/** @override */
+SourceBuffer.prototype.dispatchEvent = function(evt) {};
+
+/** @type {string} */
+SourceBuffer.prototype.appendMode;
+
+/** @type {boolean} */
+SourceBuffer.prototype.updating;
+
+/** @type {TimeRanges} */
+SourceBuffer.prototype.buffered;
+
+/** @type {number} */
+SourceBuffer.prototype.timestampOffset;
+
+/** @type {number} */
+SourceBuffer.prototype.appendWindowStart;
+
+/** @type {number} */
+SourceBuffer.prototype.appendWindowEnd;
+
+/**
+ * @param {Uint8Array} data
+ */
+SourceBuffer.prototype.append = function(data) {};
+
+/**
+ * @param {ArrayBuffer|ArrayBufferView} data
+ */
+SourceBuffer.prototype.appendBuffer = function(data) {};
+
+/**
+ * Abort the current segment append sequence.
+ */
+SourceBuffer.prototype.abort = function() {};
+
+/**
+ * @param {number} start
+ * @param {number} end
+ */
+SourceBuffer.prototype.remove = function(start, end) {};