Correct indentation, JSDoc, etc... to comply with closure linter.

ui/file_manager/video_player/js/background.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';
 
 // Stores the app windows OLNY for test purpose.
 // We SHOULD NOT use it as it is except for test, since the files which have
 // the same name will be overridden each other.
 var appWindowsForTest = {};
@@ skipping 50 matching lines @@
       // TODO(yoshiki): handle error in a smarter way.
       open('', 'error');  // Empty URL shows the error message.
     }
     fulfill();
   }.wrap());
 }
 
 /**
  * Opens player window.
  * @param {Array.<Object>} videos List of videos to play.
- * @param {Promise} Promise to be fulfilled on success, or rejected on error.
+ * @return {Promise} Promise to be fulfilled on success, or rejected on error.
  */
 function open(videos) {
   return new Promise(function(fulfill, reject) {
     chrome.app.window.create('video_player.html', {
       id: 'video',
       frame: 'none',
       singleton: false,
       minWidth: 480,
       minHeight: 270
     },
@@ skipping 11 matching lines @@
     chrome.runtime.sendMessage({ready: true});
   }).catch(function(error) {
     console.error('Launch failed', error.stack || error);
     return Promise.reject(error);
   });
 }
 
 // If is is run in the browser test, wait for the test resources are installed
 // as a component extension, and then load the test resources.
 if (chrome.test) {
+  /** @type {string} */
   window.testExtensionId = 'ljoplibgfehghmibaoaepfagnmbbfiga';
   chrome.runtime.onMessageExternal.addListener(function(message) {
     if (message.name !== 'testResourceLoaded')
       return;
     var script = document.createElement('script');
     script.src =
         'chrome-extension://' + window.testExtensionId +
         '/common/test_loader.js';
     document.documentElement.appendChild(script);
   });
 }