MD History: Add icon in top right of page when showing synced results

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');
 
 /** @type {Promise} */
@@ skipping 40 matching lines @@
 
 /**
  * Called by the history backend after receiving results and after discovering
  * the existence of other forms of browsing history.
  * @param {boolean} hasSyncedResults Whether there are synced results.
  * @param {boolean} includeOtherFormsOfBrowsingHistory Whether to include
  *     a sentence about the existence of other forms of browsing history.
  */
 function showNotification(
     hasSyncedResults, includeOtherFormsOfBrowsingHistory) {
-  // TODO(msramek): |hasSyncedResults| was used in the old WebUI to show
-  // the message about other signed-in devices. This message does not exist
-  // in the MD history anymore, so the parameter is not needed. Remove it
-  // when WebUI is removed and this becomes the only client of
-  // BrowsingHistoryHandler.
   waitForAppUpgrade().then(function() {
-    /** @type {HistoryAppElement} */ ($('history-app')).showSidebarFooter =
-        includeOtherFormsOfBrowsingHistory;
+    var app = /** @type {HistoryAppElement} */ ($('history-app'));
+    app.showSidebarFooter = includeOtherFormsOfBrowsingHistory;
+    app.hasSyncedResults = hasSyncedResults;
   });
 }
 
 /**
  * Receives the synced history data. An empty list means that either there are
  * no foreign sessions, or tab sync is disabled for this profile.
  * |isTabSyncEnabled| makes it possible to distinguish between the cases.
  *
  * @param {!Array<!ForeignSession>} sessionList Array of objects describing the
  *     sessions from other devices.
@@ skipping 21 matching lines @@
  * @param {boolean} isUserSignedIn Whether user is signed in or not now.
  */
 function updateSignInState(isUserSignedIn) {
   waitForAppUpgrade().then(function() {
     if ($('history-app')) {
       /** @type {HistoryAppElement} */($('history-app'))
           .updateSignInState(isUserSignedIn);
     }
   });
 }