Introduce new basic playback test.

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 () {

[shadi, 2012/01/25 19:30:04]

I am not sure why we need this function? Can't we just call a
startTest(videoName) from PyAuto instead of parsing the URL parameters?

[DaleCurtis, 2012/01/25 23:59:25]

We could, in this case though this test will be going into the list of tests
PyAuto runs on every platform, not just our perf builder. As such, I tried to
reduce the number of automation calls to reduce execution time.

In any case, this functionality is useful to have.

+  // 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.
+  var d = function (s) { return decodeURIComponent(s.replace(/\+/g, ' ')); }

[Ami GONE FROM CHROMIUM, 2012/01/25 17:58:48]

Why var and not just
function d(s) {...}
?

[DaleCurtis, 2012/01/25 23:59:25]

Done.

+
+  var match;
+  while (match = r.exec(window.location.search.substring(1)))
+     params[d(match[1])] = d(match[2]);
+
+  return params;
+} ();

[shadi, 2012/01/25 19:30:04]

Does this directly call the QueryString function when the file loads? 

[DaleCurtis, 2012/01/25 23:59:25]

Yes.