Add the revision details widget to sheriff-o-matic

Tools/GardeningServer/model/ct-commit-log.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.html'>
 
 <link rel='import' href='ct-repositories.html'>
 
 <script>
 function CTCommitLog() {
   this.commits = {};
   this.firstRevision = {};
+  this.lastRevision = {};
   this._repositories = new CTRepositories();
 }
 
 CTCommitLog.prototype.update = function() {
   var requests = [];
   Object.keys(this._repositories.repositories, (function(name, repository) {
     var responseHandler = this._handleResponse.bind(this, repository.repositoryUrl, repository.name);
     // FIXME: Turn net.js into net.html and import it at the top of this file.
     requests.push(net.ajax({url: repository.dataUrl}).then(responseHandler));
   }.bind(this)));
   return Promise.all(requests);
 }
 
 CTCommitLog.prototype._handleResponse = function(repositoryUrl, repository, json) {
   if (!this.commits[repository])
     this.commits[repository] = {};
 
   // FIXME: Fix googlesource to not do this outdated JSON XSS mitigation.
   json = json.substring(')]}\n'.length);
   JSON.parse(json).log.forEach(function(entry) {
     var commit = CTCommit.create(entry.author.name, entry.message, repositoryUrl, repository);
     this.commits[repository][commit.revision] = commit;
   }.bind(this));
 
-  this.firstRevision[repository] = Object.keys(this.commits[repository]).sort()[0];
+  this._findFirstAndLastRevisions(repository);
+}
+
+CTCommitLog.prototype._findFirstAndLastRevisions = function(repository) {
+  var sortedCommits = Object.keys(this.commits[repository]).sort();
+  this.firstRevision[repository] = parseInt(sortedCommits.first());
+  this.lastRevision[repository] = parseInt(sortedCommits.last());
 }
 
 CTCommitLog.prototype.range = function(repository, first, last) {
   var commits = [];
   for (var revision = first; revision <= last; revision++) {
     // Until we've seen a commit we have data for, fill in dummy data
     // so that we show something. Assume that we have the correct data
     // for all the commits after the first one we have data for.
     if (revision >= this.firstRevision[repository]) {
       var commit = this.commits[repository][revision];
       if (commit)
         commits.push(commit);
     } else {
       var url = this._repositories.repositories[repository].repositoryUrl;
       commits.push(CTCommit.createIncomplete(url, revision, repository));
     }
   }
   return commits;
 }
 </script>