Files app: Compile custom elements.

ui/file_manager/externs/web_animation.js

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @interface
+ * @extends {EventTarget}
+ */
+function Animation() {}
+
+/**
+ * @param {boolean=} opt_useCapture
+ * @override
+ */
+Animation.prototype.addEventListener =
+    function(type, listener, opt_useCapture) {}
+
+/**
+ * @type {!Promise}
+ */
+Animation.prototype.finished;
+
+/**
+ * @param {!Array} keyframes
+ * @param {number|!Object} options
+ * @returns {!Animation}
+ */
+Element.prototype.animate = function(keyframes, options) {}