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diff --git a/catapult/third_party/polymer/components/web-animations-js/externs/web-animations.js b/catapult/third_party/polymer/components/web-animations-js/externs/web-animations.js
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+/*
+ * Copyright 2016 Google Inc. All rights reserved.
+ *
+ * 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 Basic externs for the Web Animations API. This is not
+ * nessecarily exhaustive. For more information, see the spec-
+ *   https://w3c.github.io/web-animations
+ * @externs
+ */
+
+
+/**
+ * @param {!Array<!Object>} frames
+ * @param {(number|AnimationEffectTimingProperties)=} opt_options
+ * @return {!Animation}
+ */
+Element.prototype.animate = function(frames, opt_options) {};
+
+
+/**
+ * @interface
+ * @extends {EventTarget}
+ */
+var Animation = function() {};
+
+/**
+ * @return {undefined}
+ */
+Animation.prototype.cancel = function() {};
+
+/**
+ * @return {undefined}
+ */
+Animation.prototype.finish = function() {};
+
+/**
+ * @return {undefined}
+ */
+Animation.prototype.reverse = function() {};
+
+/**
+ * @return {undefined}
+ */
+Animation.prototype.pause = function() {};
+
+/**
+ * @return {undefined}
+ */
+Animation.prototype.play = function() {};
+
+/** @type {number} */
+Animation.prototype.startTime;
+
+/** @type {number} */
+Animation.prototype.currentTime;
+
+/** @type {number} */
+Animation.prototype.playbackRate;
+
+/** @type {string} */
+Animation.prototype.playState;
+
+/** @type {?function(!Event)} */
+Animation.prototype.oncancel;
+
+/** @type {?function(!Event)} */
+Animation.prototype.onfinish;
+
+
+/**
+ * @typedef {{
+ *   delay: (number|undefined),
+ *   endDelay: (number|undefined),
+ *   fillMode: (string|undefined),
+ *   iterationStart: (number|undefined),
+ *   iterations: (number|undefined),
+ *   duration: (number|string|undefined),
+ *   direction: (string|undefined),
+ *   easing: (string|undefined)
+ * }}
+ */
+var AnimationEffectTimingProperties;
+
+
+/**
+ * @interface
+ */
+var AnimationEffectTiming = function() {};
+
+/** @type {number} */
+AnimationEffectTiming.prototype.delay;
+
+/** @type {number} */
+AnimationEffectTiming.prototype.endDelay;
+
+/** @type {string} */
+AnimationEffectTiming.prototype.fillMode;
+
+/** @type {number} */
+AnimationEffectTiming.prototype.iterationStart;
+
+/** @type {number} */
+AnimationEffectTiming.prototype.iterations;
+
+/** @type {number|string} */
+AnimationEffectTiming.prototype.duration;
+
+/** @type {string} */
+AnimationEffectTiming.prototype.direction;
+
+/** @type {string} */
+AnimationEffectTiming.prototype.easing;