Send 'key' from fake keyboard events generated by file_manager.

ui/file_manager/integration_tests/gallery/open_image_files.js

 // Copyright 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';
 
 /**
  * Runs a test to open a single image.
  *
  * @param {string} testVolumeName Test volume name passed to the addEntries
@@ skipping 96 matching lines @@
  */
 function openMultipleImagesAndChangeToSlideMode(testVolumeName, volumeType) {
   var testEntries = [ENTRIES.desktop, ENTRIES.image3];
   var launchedPromise = launch(testVolumeName, volumeType, testEntries);
   return launchedPromise.then(function(args) {
     var appId = args.appId;
     return confirmTwoImagesAreLoadedInThumbnailMode(appId).then(function() {
       // Press Enter key and mode should be changed to slide mode.
       return gallery.callRemoteTestUtil(
           'fakeKeyDown', appId,
-          [null /* active element */, 'Enter', false, false, false]);
+          [null /* active element */, 'Enter', 'Enter', false, false, false]);
     }).then(function() {
       // Wait until it changes to slide mode.
       return gallery.waitForElement(appId, '.gallery[mode="slide"]');
     });
   });
 }
 
 /**
  * The openSingleImage test for Downloads.
  * @return {Promise} Promise to be fulfilled with on success.
@@ skipping 26 matching lines @@
   return openMultipleImages('drive', 'drive');
 };
 
 /**
  * The openMultipleImagesAndChangeToSlideMode test for Downloads.
  * @return {Promise} Promise to be fulfilled with on success.
  */
 testcase.openMultipleImagesAndChangeToSlideModeOnDownloads = function() {
   return openMultipleImagesAndChangeToSlideMode('local', 'downloads');
 };