chrome/browser/resources/ntp4/logging.js

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * @fileoverview
   7  * Logging info for benchmarking purposes. Should be the first js file included.
   8  */
   9
  10 /* Stack of events that has been logged. */
  11 var eventLog = [];
  12
  13 /**
  14  * Logs an event.
  15  * @param {string} name The name of the event (can be any string).
  16  * @param {boolean=} opt_shouldLogTime If true, the event is used for
  17  *     benchmarking and the time is logged. Otherwise, just push the event on
  18  *     the event stack.
  19  */
  20 function logEvent(name, opt_shouldLogTime) {
  21   if (opt_shouldLogTime)
  22     chrome.send('metricsHandler:logEventTime', [name]);
  23   eventLog.push([name, Date.now()]);
  24 }
  25
  26 logEvent('Tab.NewTabScriptStart', true);
  27 window.addEventListener('load', function(e) {
  28   logEvent('Tab.NewTabOnload', true);
  29 });
  30 document.addEventListener('DOMContentLoaded', function(e) {
  31   logEvent('Tab.NewTabDOMContentLoaded', true);
  32 });