Apply object updates from the network without blowing away object identity or UI attributes.

Tools/GardeningServer/ui/test/ct-failure-card-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-failure-card.html">
 
 <link rel="import" href="../../model/ct-commit-list-mock.html">
 <link rel="import" href="../../model/ct-commit-log-mock.html">
 <link rel="import" href="../../model/ct-failure-group.html">
 
 <script>
 (function () {
 
 var assert = chai.assert;
 
 describe('ct-failure-card', function() {
   var group;
   var card;
   var failures;
 
   beforeEach(function(done) {
     card = document.createElement('ct-failure-card');
     var cl = new CTCommitListMock();
-    group = new CTFailureGroup([
+    group = new CTFailureGroup('', [
         new CTFailure('autobot', 'unknown', {someBuilder: {key: 'a'}}, {'blink':158547},
                       {'blink':158544})], cl);
     card.group = group;
     card.commitLog = new CTCommitLogMock();
     setTimeout(done);
   });
 
   describe('failure card UI', function() {
 
     it('should have commit summaries', function(done) {
@@ skipping 93 matching lines @@
           done();
         });
       });
     });
   });
 
 });
 
 })()
 </script>