Don't add extra items to sheriff-o-matic history.

Tools/GardeningServer/ui/test/ct-embedded-flakiness-dashboard-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-embedded-flakiness-dashboard.html">
 
 <script>
 (function () {
 
 var assert = chai.assert;
 
 describe('ct-embedded-flakiness-dashboard', function() {
-  it('should point the iframe to the dashboard', function(done) {
-    var failure = new CTFailure('foo_tests', 'foo/bar.html');
-    var tree = "blink";
-    var embeddedFlakinessDashboard = document.createElement('ct-embedded-flakiness-dashboard');
-    embeddedFlakinessDashboard.test = failure;
-    embeddedFlakinessDashboard.tree = tree;
 
-    setTimeout(function() {
+  describe('iframe location', function() {
+    var embeddedFlakinessDashboard;
+
+    after(function() {
+      document.body.removeChild(embeddedFlakinessDashboard);
+    });
+
+    it('should point the iframe to the dashboard', function(done) {
+      var failure = new CTFailure('foo_tests', 'foo/bar.html');
+      failure.embeddedFlakinessDashboardURL = function(tree) {
+        return 'placeholder.html?' + this.flakinessDashboardURL(tree) + '&showChrome=false';
+      }
+
+      var tree = "blink";
+      embeddedFlakinessDashboard = document.createElement('ct-embedded-flakiness-dashboard');
+      embeddedFlakinessDashboard.hidden = true;
+      embeddedFlakinessDashboard.test = failure;
+      embeddedFlakinessDashboard.tree = tree;
+      document.body.appendChild(embeddedFlakinessDashboard);
+
       var iframe = embeddedFlakinessDashboard.shadowRoot.querySelector('#iframe');
-      assert.equal(iframe.src, failure.embeddedFlakinessDashboardURL(tree));
-      done();
+      iframe.addEventListener('load', function() {
+        assert.include(iframe.contentWindow.location.href,
+                       failure.embeddedFlakinessDashboardURL(tree));
+        done();
+      });
     });
   });
 
   it('should respond to heightChanged', function(done) {
     var embeddedFlakinessDashboard = document.createElement('ct-embedded-flakiness-dashboard');
 
     var finishTest = function() {
       window.removeEventListener('message', finishTest);
       var iframe = embeddedFlakinessDashboard.shadowRoot.querySelector('#iframe');
       assert.equal(iframe.style.height, '100px');
       done();
     };
 
     window.addEventListener('message', finishTest);
     window.postMessage({command: 'heightChanged', height: "100"}, '*');
   });
 });
 
 })()
 </script>