code: public boolean users_hasAppPermission(CharSequence permission)
      throws FacebookException, IOException {
      return extractBoolean(this.callMethod(FacebookMethod.USERS_HAS_APP_PERMISSION,
                                            new Pair<String, CharSequence>("ext_perm", permission)));
    }
docs: Retrieves whether the logged-in user has granted the specified permission
  to this application.
  @param permission an extended permission (e.g. FacebookExtendedPerm.MARKETPLACE,
  "photo_upload")
  @return boolean indicating whether the user has the permission
  @see FacebookExtendedPerm
  @see <a href="http://wiki.developers.facebook.com/index.php/Users.hasAppPermission">
  Developers Wiki: Users.hasAppPermission</a>