CNS seek tests for <video>.

chrome/test/data/media/html/utils.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.
 //
 // Miscellaneous utility functions for HTML media tests. Loading this script
 // should not modify the page in any way.
 //
 
 var QueryString = function () {
   // Allows access to query parameters on the URL; e.g., given a URL like:
   //
   //    http://<url>/my.html?test=123&bob=123
   //
   // parameters can now be accessed via QueryString.test or QueryString.bob.
   var params = {};
 
   // RegEx to split out values by &.
   var r = /([^&=]+)=?([^&]*)/g;
 
   // Lambda function for decoding extracted match values. Replaces '+' with
   // space so decodeURIComponent functions properly.
   function d(s) { return decodeURIComponent(s.replace(/\+/g, ' ')); }
 
   var match;
   while (match = r.exec(window.location.search.substring(1)))
     params[d(match[1])] = d(match[2]);
 
   return params;
 } ();
+
+function Timer() {
+  this.start_ = 0;
+  this.times_ = [];
+}
+
+Timer.prototype = {
+  start: function() {
+    this.start_ = new Date().getTime();
+  },
+
+  stop: function() {
+    var delta = new Date().getTime() - this.start_;
+    this.times_.push(delta);
+    return delta;
+  },
+
+  reset: function() {
+    this.start_ = 0;
+    this.times_ = [];
+  }
+}
+
+function GenerateUniqueURL(src) {
+  var ch = src.indexOf('?') >= 0 ? '&' : '?';
+  return src + ch + 't=' + (new Date()).getTime();
+}