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

Tools/GardeningServer/model/ct-commit-list.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-log.html">
+<link rel="import" href="ct-repository-commit-list.html">
 
 <script>
 function CTCommitList(commitLog, revisions) {
   this._initRevisions(revisions);
   this.update(commitLog);
 }
 
 CTCommitList.prototype.update = function(commitLog) {
   this.repositories = [];
   if (!commitLog)
     return;
 
   var allRepositories = commitLog._repositories.names;
   for (var i = 0; i < allRepositories.length; i++) {
     var repository = allRepositories[i];
     if (!this.revisions[repository])
       continue;
 
     var commits = commitLog.range(repository, this.revisions[repository]);
     if (!commits.length)
       continue;
 
-    this.repositories.push({
-      name: repository,
-      range: this._displayRange(commits, repository),
-      commits: commits,
-      expanded: false
-    });
+    this.repositories.push(new CTRepositoryCommitList(repository, commits));
   }
 };
 
 CTCommitList.prototype._initRevisions = function(repoRevisions) {
   this.revisions = {};
   repoRevisions.forEach(function(repoRevision) {
     var split = repoRevision.split(':');
     var repo = split[0];
     var revision = parseInt(split[1], 10);
     if (revision && repo) {
       if (!this.revisions[repo]) {
         this.revisions[repo] = [revision];
       } else {
         this.revisions[repo].push(revision);
       }
     }
   }.bind(this));
 };
 
-CTCommitList.prototype._displayRange = function(commits) {
-  return commits.first().revision + " : " + commits.last().revision;
-};
-
 </script>