Add a notice about other forms of browsing history to the History WebUI.

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 79 matching lines @@
     if (info.finished)
       list.disableResultLoading();
     // TODO(tsergeant): Showing everything as soon as the list is ready is not
     // ideal, as the sidebar can still pop in after. Fix this to show everything
     // at once.
     document.body.classList.remove('loading');
   });
 }
 
 /**
+ * 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.
+}
+
+/**
  * 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?
  */
 function setForeignSessions(sessionList, isTabSyncEnabled) {
   // TODO(calamity): Add a 'no synced devices' message when sessions are empty.
@@ skipping 21 matching lines @@
  * Called by the history backend when the deletion failed.
  */
 function deleteFailed() {
 }
 
 /**
  * Called when the history is deleted by someone else.
  */
 function historyDeleted() {
 }