Add a timeline view to about:net-internals.

chrome/browser/resources/net_internals/time_util.js

 // Copyright (c) 2011 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.
 
 var timeutil = (function() {
   'use strict';
 
   /**
    * Offset needed to convert event times to Date objects.
    * Updated whenever constants are loaded.
@@ skipping 14 matching lines @@
    * This function converts the tick count to a Date() object.
    *
    * @param {String} timeTicks.
    * @returns {Date} The time that |timeTicks| represents.
    */
   function convertTimeTicksToDate(timeTicks) {
     var timeStampMs = timeTickOffset + (timeTicks - 0);
     return new Date(timeStampMs);
   }
 
+  /**
+   * Returns the current time.
+   *
+   * @returns {number} Milliseconds since the Unix epoch.
+   */
+  function getCurrentTime() {
+    return (new Date()).getTime();
+  }
+
   return {
     setTimeTickOffset: setTimeTickOffset,
-    convertTimeTicksToDate: convertTimeTicksToDate
+    convertTimeTicksToDate: convertTimeTicksToDate,
+    getCurrentTime: getCurrentTime
   };
 })();