[MD History] Make sidebar menu respond to spacebar.

chrome/test/data/webui/md_history/history_routing_test.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.
 
 cr.define('md_history.history_routing_test', function() {
   function registerTests() {
     suite('routing-test', function() {
       var app;
       var list;
       var toolbar;
@@ skipping 15 matching lines @@
 
       test('route updates from sidebar', function() {
         var menu = sidebar.$.menu;
         assertEquals('', app.routeData_.page);
         assertEquals('chrome://history/', window.location.href);
 
         MockInteractions.tap(menu.children[1]);
         assertEquals('syncedTabs', app.routeData_.page);
         assertEquals('chrome://history/syncedTabs', window.location.href);
 
-        MockInteractions.tap(menu.children[0]);
+        MockInteractions.keyDownOn(menu.children[0], 32, '', "Space");
         assertEquals('', app.routeData_.page);
         assertEquals('chrome://history/', window.location.href);
       });
 
       test('route updates from search', function() {
         var searchTerm = 'McCree';
         assertEquals('', app.routeData_.page);
         toolbar.setSearchTerm(searchTerm);
         assertEquals(searchTerm, app.queryParams_.q);
       });
@@ skipping 66 matching lines @@
         }
 
         registerMessageCallback('queryHistory', this, verifyFunction);
       });
     });
   }
   return {
     registerTests: registerTests
   };
 });