[MD History] Focus the search bar on load.

chrome/test/data/webui/md_history/history_toolbar_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_toolbar_test', function() {
   function registerTests() {
     suite('history-toolbar', function() {
       var app;
       var element;
       var toolbar;
@@ skipping 36 matching lines @@
         registerMessageCallback('queryHistory', this, function (info) {
           assertEquals('Test', info[0]);
           done();
         });
 
         toolbar.$$('cr-toolbar').fire('search-changed', 'Test');
       });
 
       test('shortcuts to open search field', function() {
         var field = toolbar.$['main-toolbar'].getSearchField();
-        assertFalse(field.showingSearch);

[tsergeant, 2016/08/15 03:28:33]

We probably shouldn't blindly delete this -- now we don't know whether the
assertions below are because of the command working correctly, or because the
field was already focused.

Can you blur the field at the start of the test?

[calamity, 2016/08/15 07:40:28]

Good point. Done.

 
         MockInteractions.pressAndReleaseKeyOn(
             document.body, 191, '', '/');
         assertTrue(field.showingSearch);
         assertEquals(field.$.searchInput, field.root.activeElement);
 
         MockInteractions.pressAndReleaseKeyOn(
             field.$.searchInput, 27, '', 'Escape');
         assertFalse(field.showingSearch, 'Pressing escape closes field.');
         assertNotEquals(field.$.searchInput, field.root.activeElement);
@@ skipping 21 matching lines @@
         element.searchedTerm = '';
         registerMessageCallback('queryHistory', this, undefined);
         toolbar.count = 0;
       });
     });
   }
   return {
     registerTests: registerTests
   };
 });