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diff --git a/chromium/third_party/catapult/third_party/polymer3/bower_components/polymer/externs/polymer-internal-shared-types.js b/chromium/third_party/catapult/third_party/polymer3/bower_components/polymer/externs/polymer-internal-shared-types.js
new file mode 100644
index 00000000000..274f60351d1
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+++ b/chromium/third_party/catapult/third_party/polymer3/bower_components/polymer/externs/polymer-internal-shared-types.js
@@ -0,0 +1,165 @@
+/**
+ * @fileoverview Internal shared types for Polymer
+ *
+ * @license
+ * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
+ * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+ * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+ * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+ * Code distributed by Google as part of the polymer project is also
+ * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+ */
+
+/* eslint-disable no-unused-vars, strict, valid-jsdoc */
+
+/**
+ * @constructor
+ * @extends {DocumentFragment}
+ */
+function StampedTemplate() { }
+/** @type {boolean} */
+StampedTemplate.prototype.__noInsertionPoint;
+/** @type {!Array<!Node>} */
+StampedTemplate.prototype.nodeList;
+/** @type {!Object<string, !Element>} */
+StampedTemplate.prototype.$;
+/** @type {!TemplateInfo | undefined} */
+StampedTemplate.prototype.templateInfo;
+
+/** @interface */
+function NodeInfo() { }
+/** @type {string} */
+NodeInfo.prototype.id;
+/** @type {!Array<{name: string, value: string}>}*/
+NodeInfo.prototype.events;
+/** @type {boolean} */
+NodeInfo.prototype.hasInsertionPoint;
+/** @type {!TemplateInfo} */
+NodeInfo.prototype.templateInfo;
+/** @type {!NodeInfo} */
+NodeInfo.prototype.parentInfo;
+/** @type {number} */
+NodeInfo.prototype.parentIndex;
+/** @type {number} */
+NodeInfo.prototype.infoIndex;
+/** @type {!Array<!Binding>} */
+NodeInfo.prototype.bindings;
+
+/** @interface */
+function TemplateInfo() { }
+/** @type {!Array<!NodeInfo>} */
+TemplateInfo.prototype.nodeInfoList;
+/** @type {!Array<!Node>} */
+TemplateInfo.prototype.nodeList;
+/** @type {boolean} */
+TemplateInfo.prototype.stripWhitespace;
+/** @type {boolean | undefined} */
+TemplateInfo.prototype.hasInsertionPoint;
+/** @type {!Object} */
+TemplateInfo.prototype.hostProps;
+/** @type {!Object} */
+TemplateInfo.prototype.propertyEffects;
+/** @type {TemplateInfo | undefined} */
+TemplateInfo.prototype.nextTemplateInfo;
+/** @type {TemplateInfo | undefined} */
+TemplateInfo.prototype.previousTemplateInfo;
+/** @type {!Array<!Node>} */
+TemplateInfo.prototype.childNodes;
+/** @type {boolean} */
+TemplateInfo.prototype.wasPreBound;
+
+/**
+ * type for HTMLTemplateElement with `_templateInfo`
+ *
+ * @constructor
+ * @extends {HTMLTemplateElement}
+ */
+function HTMLTemplateElementWithInfo() { }
+/** @type {TemplateInfo} */
+HTMLTemplateElementWithInfo.prototype._templateInfo;
+
+/**
+ * @typedef {{
+ * literal: string,
+ * compoundIndex: (number | undefined)
+ * }}
+ */
+let LiteralBindingPart;
+
+/**
+ * @typedef {{
+ * literal: boolean,
+ * name: string,
+ * value: (string | number),
+ * rootProperty: (string | undefined),
+ * structured: (boolean | undefined),
+ * wildcard: (boolean | undefined)
+ * }}
+ */
+let MethodArg;
+
+/**
+ * @typedef {{
+ * methodName: string,
+ * static: boolean,
+ * args: !Array<!MethodArg>,
+ * dynamicFn: (boolean | undefined),
+ * }}
+ */
+let MethodSignature;
+
+/**
+ * @typedef {{
+ * mode: string,
+ * negate: boolean,
+ * source: string,
+ * dependencies: !Array<(!MethodArg|string)>,
+ * customEvent: boolean,
+ * signature: Object,
+ * event: string
+ * }}
+ */
+let ExpressionBindingPart;
+
+/**
+ * @typedef {LiteralBindingPart | ExpressionBindingPart}
+ */
+let BindingPart;
+
+/**
+ * @typedef {{
+ * kind: string,
+ * target: string,
+ * parts: Array<!BindingPart>,
+ * literal: (string | undefined),
+ * isCompound: boolean,
+ * listenerEvent: (string | undefined),
+ * listenerNegate: (boolean | undefined)
+ * }}
+ */
+let Binding;
+
+/**
+ * @typedef {{
+ * path: string
+ * }}
+ */
+let PathInfo;
+
+/**
+ * @typedef {{
+ * forwardHostProp: (function(string, *) | undefined),
+ * instanceProps: (Object | undefined),
+ * mutableData: (boolean | undefined),
+ * notifyInstanceProp: (function(*, string, *) | undefined),
+ * parentModel: (boolean | undefined)
+ * }}
+ */
+let TemplatizeOptions;
+
+/** @record */
+function AsyncInterface(){}
+/** @type {function(!Function, number=): number} */
+AsyncInterface.prototype.run;
+/** @type {function(number): void} */
+AsyncInterface.prototype.cancel;