[MD History] Use openForeignSession message to open foreign session tabs.

chrome/browser/resources/md_history/constants.js

 // Copyright 2016 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.
 
 // Globals:
 /** @const */ var RESULTS_PER_PAGE = 150;
 
 /**
  * Amount of time between pageviews that we consider a 'break' in browsing,
  * measured in milliseconds.
@@ skipping 27 matching lines @@
  *            searchTerm: string}}
  */
 var QueryState;
 
 /**
  * @typedef {{info: ?HistoryQuery,
  *            results: ?Array<!HistoryEntry>,
  *            sessionList: ?Array<!ForeignSession>}}
  */
 var QueryResult;
+
+/** @constructor
+ *  @extends {CustomEvent} */
+var TapEvent = function() {
+  this.model = null;
+};