MD History: Update sign in state in data source

chrome/browser/resources/md_history/app.crisper.js

 // Copyright 2016 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.
 function PromiseResolver() {
   this.resolve_;
   this.reject_;
   this.promise_ = new Promise(function(resolve, reject) {
     this.resolve_ = resolve;
     this.reject_ = reject;
   }.bind(this));
@@ skipping 5313 matching lines @@
     }
     return lazyLoadPromise;
   }
   return {
     ensureLazyLoaded: ensureLazyLoaded
   };
 });
 
 Polymer({
   is: 'history-app',
-  behaviors: [ Polymer.IronScrollTargetBehavior ],
+  behaviors: [ Polymer.IronScrollTargetBehavior, WebUIListenerBehavior ],
   properties: {
     showSidebarFooter: Boolean,
     hasSyncedResults: Boolean,
     selectedPage_: {
       type: String,
       observer: 'selectedPageChanged_'
     },
     grouped_: {
       type: Boolean,
       reflectToAttribute: true
@@ skipping 45 matching lines @@
     'delete-selected': 'deleteSelected',
     'history-close-drawer': 'closeDrawer_',
     'history-view-changed': 'historyViewChanged_'
   },
   ready: function() {
     this.grouped_ = loadTimeData.getBoolean('groupByDomain');
     cr.ui.decorate('command', cr.ui.Command);
     document.addEventListener('canExecute', this.onCanExecute_.bind(this));
     document.addEventListener('command', this.onCommand_.bind(this));
   },
+  attached: function() {
+    this.addWebUIListener('sign-in-state-updated', this.updateSignInState.bind(this));
+  },
   onFirstRender: function() {
     setTimeout(function() {
       chrome.send('metricsHandler:recordTime', [ 'History.ResultsRenderedTime', window.performance.now() ]);
     });
     if (!this.hasDrawer_) {
       this.focusToolbarSearchField();
     }
     md_history.ensureLazyLoaded();
   },
   _scrollHandler: function() {
@@ skipping 107 matching lines @@
 
        case HistoryRange.MONTH:
         histogramValue = HistoryPageViewHistogram.GROUPED_MONTH;
         break;
       }
       break;
     }
     md_history.BrowserService.getInstance().recordHistogram('History.HistoryPageView', histogramValue, HistoryPageViewHistogram.END);
   }
 });