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..220488aaa338023409effb37309fd6143868f2b9 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 = $('history-app');
+  waitForUpgrade(appElem).then(function() {
+    /** @type {HistoryAppElement} */(appElem)
+        .$['side-bar'].showFooter = includeOtherFormsOfBrowsingHistory;

[Dan Beam, 2016/07/12 02:05:57]

can we not poke into the local DOM of #history-app?  i.e. export the side bar as
a property or a getter() or something.

[msramek, 2016/07/12 13:56:36]

It was specifically calamity@ who suggested this in the last iteration to avoid
defining additional properties on history-app.

Defining a getter for the side bar sounds reasonable to me though - calamity@,
would you agree with that?

+  });
 }
 
 /**