Add button to add new FSP services to Files app.

ui/file_manager/integration_tests/file_manager/copy_between_windows.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';
 
 /**
  * Opens two window of given root paths.
  * @param {string} rootPath1 Root path of the first window.
  * @param {string} rootPath2 Root path of the second window.
@@ skipping 40 matching lines @@
     return remoteCall.callRemoteTestUtil('execCommand', windowId2, ['paste']);
   }).
   then(function() {
     return remoteCall.waitForFiles(windowId2,
                                    [file.getExpectedRow()],
                                    {ignoreLastModifiedTime: true});
   });
 };
 
 var REMOVABLE_VOLUME_QUERY = '#directory-tree > .tree-item > .tree-row ' +
-    '.volume-icon[volume-type-icon="removable"]';
+    '.item-icon[volume-type-icon="removable"]';
 
 testcase.copyBetweenWindowsDriveToLocal = function() {
   var windowId1;
   var windowId2;
   StepsRunner.run([
       // Make a file in a drive directory.
       function() {
         addEntries(['drive'], [ENTRIES.hello], this.next);
       },
       // Open windows.
@@ skipping 201 matching lines @@
     },
     // Copy a file between windows.
     function(appIds) {
       copyBetweenWindows(windowId1, windowId2, ENTRIES.hello).then(this.next);
     },
     function() {
       checkIfNoErrorsOccured(this.next);
     }
   ]);
 };