Expose the chromium waterfall in sheriff-o-matic.

Tools/GardeningServer/ui/ct-commit-tests.html

 <!--
 Copyright 2014 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.
 -->
 
 <link rel="import" href="ct-commit.html">
 
 <link rel="import" href="../model/ct-commit-mock.html">
 
 <script>
 (function () {
 
 module("ct-commit");
 
 asyncTest("basic", 3, function() {
-  var grouper = document.createElement('ct-commit');
+  var commit = document.createElement('ct-commit');
 
-  grouper.data = new CTCommitMock();
+  commit.data = new CTCommitMock();
 
   requestAnimationFrame(function() {
-    var html = grouper.shadowRoot.innerHTML;
+    var html = commit.shadowRoot.innerHTML;
 
     equal(html.indexOf('mkwst') != -1, true);
     equal(html.indexOf('behavior for these types') != -1, true);
-    equal(grouper.shadowRoot.querySelector('a').href, grouper.data.url);
+    equal(commit.shadowRoot.querySelector('a').href, commit.data.url);
 
     start();
   });
 });
 
 })()
 </script>