apiFunctions.setHandleRequest('retainEntry', function(fileEntry) {
    var id = entryIdManager.getEntryId(fileEntry);
    if (!id)
      return '';
    var fileSystemName = fileEntry.filesystem.name;
    var relativePath = $String.slice(fileEntry.fullPath, 1);

    sendRequest(this.name, [id, fileSystemName, relativePath],
      this.definition.parameters, {});
    return id;
  });
 apiFunctions.setHandleRequest('getEntryId', function(fileEntry) {
   return entryIdManager.getEntryId(fileEntry);
 });