Files App: Update the context menu when installed app is changed.

ui/file_manager/file_manager/foreground/js/task_controller_unittest.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.
 
 window.metrics = {
   recordEnum: function() {}
 };
 
 function MockMetadataModel(properties) {
   this.properties_ = properties;
@@ skipping 16 matching lines @@
   cr.ui.decorate('command', cr.ui.Command);
 }
 
 function testExecuteEntryTask(callback) {
   window.chrome.fileManagerPrivate = {
     getFileTasks: function(entries, callback) {
       setTimeout(callback.bind(null, [
         {taskId:'handler-extension-id|file|open', isDefault: false},
         {taskId:'handler-extension-id|file|play', isDefault: true}
       ]), 0);
-    }
+    },
+    onAppsUpdated: {
+      addListener: function() {},
+    },
   };
 
   var fileSystem = new MockFileSystem('volumeId');
   fileSystem.entries['/test.png'] =
       new MockFileEntry(fileSystem, '/test.png', {});
   var controller = new TaskController(
       DialogType.FULL_PAGE,
       {
         getDriveConnectionState: function() {
           return VolumeManagerCommon.DriveConnectionType.ONLINE;
@@ skipping 15 matching lines @@
       new cr.EventTarget(),
       null);
 
   controller.executeEntryTask(fileSystem.entries['/test.png']);
   reportPromise(new Promise(function(fulfill) {
     chrome.fileManagerPrivate.executeTask = fulfill;
   }).then(function(info) {
     assertEquals("handler-extension-id|file|play", info);
   }), callback);
 }