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

Tools/GardeningServer/ui/test/ct-failure-stream-tests.html

Index: Tools/GardeningServer/ui/test/ct-failure-stream-tests.html
diff --git a/Tools/GardeningServer/ui/test/ct-failure-stream-tests.html b/Tools/GardeningServer/ui/test/ct-failure-stream-tests.html
index 8a0b21453dcb75034b84c7c6f5a926f6b03d2db8..3e9096c112835e6d122b0a4dfcb43f8b07aea8ed 100644
--- a/Tools/GardeningServer/ui/test/ct-failure-stream-tests.html
+++ b/Tools/GardeningServer/ui/test/ct-failure-stream-tests.html
@@ -26,7 +26,8 @@ describe('ct-failure-stream', function() {
       // ct-failure-stream will give these values to ct-commit-data,
       // which will hit the network unless we figure out how to mock
       // out ct-commit-data in a better way.
-      stream.groups = [new CTFailureGroup([], undefined), new CTFailureGroup([], undefined)];
+      stream.groups = [new CTFailureGroup('', [], undefined),
+                       new CTFailureGroup('', [], undefined)];
       stream.category = 'default';
       setTimeout(function() {
         var cards = stream.shadowRoot.querySelectorAll('ct-failure-card');
@@ -39,8 +40,8 @@ describe('ct-failure-stream', function() {
   describe('category', function() {
     it('should only show failure groups for the specified category', function(done) {
       var failures = [new CTFailure('step', 'reason', [{key: 'a', annotation: {snoozeTime: Date.now() + 1000 * 1000}}])];
-      var snoozed = new CTFailureGroup(failures, undefined);
-      stream.groups = [new CTFailureGroup([], undefined), snoozed];
+      var snoozed = new CTFailureGroup('', failures, undefined);
+      stream.groups = [new CTFailureGroup('', [], undefined), snoozed];
       stream.category = 'snoozed';
       setTimeout(function() {
         var cards = stream.shadowRoot.querySelectorAll('ct-failure-card');