MD History: Update sign in state in data source

chrome/browser/resources/md_history/synced_device_manager.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.
 
 /**
  * @typedef {{device: string,
  *           lastUpdateTime: string,
  *           opened: boolean,
  *           separatorIndexes: !Array<number>,
  *           timestamp: number,
@@ skipping 49 matching lines @@
     hasSeenForeignData_: Boolean,
   },
 
   listeners: {
     'toggle-menu': 'onToggleMenu_',
     'scroll': 'onListScroll_'
   },
 
   /** @override */
   attached: function() {
-    // Update the sign in state.
-    chrome.send('otherDevicesInitialized');

[calamity, 2016/09/28 02:54:23]

You can keep this in and then AllowJavascript() in the handler. You'll need to
check IsJavascriptAllowed() before calling as well.

[lshang, 2016/09/29 08:06:47]

Done. Good idea

     md_history.BrowserService.getInstance().recordHistogram(
         SYNCED_TABS_HISTOGRAM_NAME, SyncedTabsHistogram.INITIALIZED,
         SyncedTabsHistogram.LIMIT);
   },
 
   /** @return {HTMLElement} */
   getContentScrollTarget: function() { return this; },
 
   /**
    * @param {!ForeignSession} session
@@ skipping 199 matching lines @@
     // User signed in, show the loading message when querying for synced
     // devices.
     this.fetchingSyncedTabs_ = true;
   },
 
   searchTermChanged: function(searchTerm) {
     this.clearDisplayedSyncedDevices_();
     this.updateSyncedDevices(this.sessionList);
   }
 });