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..0cf1617008a0231191fb9e3d69e9aa69ceeebe15 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(

[calamity, 2016/07/05 04:03:13]

Does this get called when the user signs in for the first time?

[msramek, 2016/07/06 19:24:10]

No - and it probably should.

This is called from BrowsingHistoryHandler, which is not a SyncServiceObserver.
It's only called when the history results are updated, which is when the entire
page is reloaded or when more results are fetched (going to the next page in the
old chrome://history, scrolling down in the new MD one).

ForeignSessionHandler *is* a SyncServiceObserver though, so we could use that
one instead.

I would leave that part to a separate CL - it's a problem on a different layer
than this CL (and effects the old chrome://history as well).

     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)
+        .showFooter = includeOtherFormsOfBrowsingHistory;

[calamity, 2016/07/05 04:03:13]

Just access the sidebar through (appElem).$['side-bar'].showFooter here. I'd
prefer the property set in appElem stay as minimal as possible.

[msramek, 2016/07/06 19:24:10]

Done. Also removed the property in history-app.

+  });
 }
 
 /**