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

chrome/browser/resources/md_history/history.js

Index: chrome/browser/resources/md_history/history.js
diff --git a/chrome/browser/resources/md_history/history.js b/chrome/browser/resources/md_history/history.js
index a81338b4be58bb0d0c77b356e643670d0c62f1d9..8f248b966dfa747c29fc5efed33c3e0c95e7fdc3 100644
--- a/chrome/browser/resources/md_history/history.js
+++ b/chrome/browser/resources/md_history/history.js
@@ -47,8 +47,16 @@ function historyResult(info, results) {
  */
 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)
+        .getSideBar().showFooter = includeOtherFormsOfBrowsingHistory;
+  });
 }
 
 /**