Expose the chromium waterfall in sheriff-o-matic.

Tools/GardeningServer/ui/ct-test-list-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-test-list.html">
 
 <script>
 (function () {
@@ skipping 33 matching lines @@
   "newestPassingRevision": 177165,
 },
 ];
 
 module("ct-test-list");
 
 asyncTest("basic", 4, function() {
   var list = document.createElement('ct-test-list');
 
   list.tests = kExampleTests;
+  list.tree = 'blink';
 
   Platform.endOfMicrotask(function() {
     var tests = list.shadowRoot.querySelectorAll('a');
     equal(tests.length, 3);
-    equal(tests[0].href, 'http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=plugins%2Fgesture-events-scrolled.html&testType=foo_step');
-    equal(tests[1].href, 'http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=plugins%2Ftransformed-events.html&testType=foo_step');
-    equal(tests[2].href, 'http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=plugins%2Fgesture-events.html&testType=foo_step');
+    equal(tests[0].href, 'http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=@ToT%20Blink&tests=plugins%2Fgesture-events-scrolled.html&testType=foo_step');
+    equal(tests[1].href, 'http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=@ToT%20Blink&tests=plugins%2Ftransformed-events.html&testType=foo_step');
+    equal(tests[2].href, 'http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=@ToT%20Blink&tests=plugins%2Fgesture-events.html&testType=foo_step');
 
     start();
   });
 });
 
 })()
 </script>