Files.app: Fix selection on creating new folder

chrome/test/data/extensions/api_test/file_manager_browsertest/background.js

 // Copyright (c) 2014 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.
 
 'use strict';
 
 /**
  * Extension ID of Files.app.
  * @type {string}
  * @const
@@ skipping 301 matching lines @@
   return repeatUntil(function() {
     return callRemoteTestUtil('getExecutedTasks', windowId, []).
         then(function(executedTasks) {
           if (executedTasks.indexOf(taskId) === -1)
             return pending('Executed task is %j', executedTasks);
         });
   });
 }
 
 /**
+ * Adds check of chrome.test to the end of the given promise.
+ * @param {Promise} promise Promise.
+ */
+function testPromise(promise) {
+  promise.then(function() {
+    return new Promise(checkIfNoErrorsOccured);
+  }).then(chrome.test.callbackPass(function() {
+    // The callbacPass is necessary to avoid prematurely finishing tests.
+    // Don't put chrome.test.succeed() here to avoid doubled success log.
+  }), function(error) {
+    chrome.test.fail(error.stack || error);
+  });
+};
+
+/**
  * Sends a fake key down event.
  * @param {string} windowId Window ID.
  * @param {string} query Query for the target element.
  * @param {string} keyIdentifer Key identifier.
  * @param {boolean} ctrlKey Control key flag.
  * @return {Promise} Promise to be fulfilled or rejected depending on the
  *     result.
  */
 function fakeKeyDown(windowId, query, keyIdentifer, ctrlKey) {
   return new Promise(function(fulfill, reject) {
@@ skipping 457 matching lines @@
         chrome.test.runTests([function() {
           chrome.test.fail(testCaseName + ' is not found.');
         }]);
         return;
       }
       chrome.test.runTests([testcase[testCaseName]]);
     }
   ];
   steps.shift()();
 });