[Devtools] Canvas network timeline experiment establishes scrolling

third_party/WebKit/Source/devtools/front_end/externs.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
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  */
 ArrayBuffer.isView = function(obj) { }
 
 /**
  * @param {Array.<Object>} keyframes
  * @param {number|Object} timing
  * @return {Object}
  */
 Element.prototype.animate = function(keyframes, timing) { }
 
+/**
+ * @override
+ * @param {string} type
+ * @param {(!EventListener|!function (!Event): (boolean|undefined)|null)} listener
+ * @param {(boolean|!{capture: (boolean|undefined), once: (boolean|undefined), passive: (boolean|undefined)})=} options
+ * @this {EventTarget}
+ */
+Element.prototype.addEventListener = function(type, listener, options) { }
+
 var acorn = {
     /**
      * @param {string} text
      * @param {Object.<string, boolean>} options
      * @return {!ESTree.Node}
      */
     parse: function(text, options) {},
 
     /**
      * @param {string} text
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 var Terminal = function(params) { }
 
 Terminal.prototype = {
     fit: function() { },
     linkify: function() { },
     /** @param {!Element} element */
     open: function(element) { },
     /** @param {string} eventName * @param {!Function} handler */
     on: function(eventName, handler) { }
 }