[IndexedDB] Adding traces, perf tests

tools/perf/page_sets/indexeddb_perf/endure/app.js

 // Copyright (c) 2012 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.
 
 // This file simulates a typical foreground process of an offline-capable
 // authoring application. When in an "offline" state, simulated user actions
 // are recorded for later playback in an IDB data store. When in an "online"
 // state, the recorded actions are drained from the store (as if being sent
 // to the server).
 
@@ skipping 254 matching lines @@
   var s = '';
   while (len--)
     s += Math.floor((Math.random() * 36)).toString(36);
   return s;
 }
 
 window.onload = function () {
   log("initializing...");
   initdb();
 };