Add a footer about other forms of history to the MD history page.

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 29 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): Implement the joint notification about web history and other
-  // forms of browsing history for the MD history page.
+  // 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.
+  var appElem = $('history-app');
+  waitForUpgrade(appElem).then(function() {
+    /** @type {HistoryAppElement} */(appElem)
+        .set('showFooter', includeOtherFormsOfBrowsingHistory);

[Dan Beam, 2016/06/30 23:30:03]

nit: you can just do

  .showFooter = includeOtherFormsOfBrowsingHistory;

this is mildly better for typechecking

[msramek, 2016/07/01 11:42:06]

Done.

+  });
 }
 
 /**
  * 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.
  * @param {boolean} isTabSyncEnabled Is tab sync enabled for this profile?
@@ skipping 16 matching lines @@
  * Called by the history backend after user's sign in state changes.
  * @param {boolean} isUserSignedIn Whether user is signed in or not now.
  */
 function updateSignInState(isUserSignedIn) {
   var appElem = $('history-app');
   waitForUpgrade(appElem).then(function() {
     /** @type {HistoryAppElement} */(appElem)
         .updateSignInState(isUserSignedIn);
   });
 }