File manager: support for zipping selected files.

chrome/browser/resources/file_manager/js/file_copy_manager_wrapper.js

 // Copyright (c) 2012 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.
 
 var fileCopyManagerWrapper = null;
 
 /**
  * While FileCopyManager is run in the background page, this class is used to
  * communicate with it.
  * @constructor
@@ skipping 116 matching lines @@
       cm[method].apply(cm, args);
     });
   };
 };
 
 FileCopyManagerWrapper.decorateAsyncMethod('requestCancel');
 FileCopyManagerWrapper.decorateAsyncMethod('paste');
 FileCopyManagerWrapper.decorateAsyncMethod('deleteEntries');
 FileCopyManagerWrapper.decorateAsyncMethod('forceDeleteTask');
 FileCopyManagerWrapper.decorateAsyncMethod('cancelDeleteTask');
+FileCopyManagerWrapper.decorateAsyncMethod('zipSelection');