MD History: Support dynamically updating synced tab data

chrome/browser/resources/md_history/history.js

 // Copyright 2015 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.
 
 // Send the history query immediately. This allows the query to process during
 // the initial page startup.
 chrome.send('queryHistory', ['', 0, 0, 0, RESULTS_PER_PAGE]);
 chrome.send('getForeignSessions');
 
 /**
@@ skipping 111 matching lines @@
  * @param {boolean} isTabSyncEnabled Is tab sync enabled for this profile?
  */
 function setForeignSessions(sessionList, isTabSyncEnabled) {
   // TODO(calamity): Add a 'no synced devices' message when sessions are empty.
   $('history-side-bar').hidden = !isTabSyncEnabled;
   var syncedDeviceElem = $('history-synced-device-manager');
   waitForUpgrade(syncedDeviceElem).then(function() {
     var syncedDeviceManager =
         /** @type {HistorySyncedDeviceManagerElement} */(syncedDeviceElem);
     if (isTabSyncEnabled)
-      syncedDeviceManager.addSyncedHistory(sessionList);
+      syncedDeviceManager.setSyncedHistory(sessionList);
   });
 }
 
 /**
  * Called by the history backend when deletion was succesful.
  */
 function deleteComplete() {
   var historyList = /** @type {HistoryListElement} */($('history-list'));
   var toolbar = /** @type {HistoryToolbarElement} */($('toolbar'));
   historyList.removeDeletedHistory(toolbar.count);
   toolbar.count = 0;
 }
 
 /**
  * Called by the history backend when the deletion failed.
  */
 function deleteFailed() {
 }
 
 /**
  * Called when the history is deleted by someone else.
  */
 function historyDeleted() {
 }