Function cef_parse_jsonand_return_error 

pub unsafe extern "C" fn cef_parse_jsonand_return_error(
    json_string: *const cef_string_t,
    options: cef_json_parser_options_t,
    error_msg_out: *mut cef_string_t,
) -> *mut _cef_value_t

Parses the specified |json_string| and returns a dictionary or list representation. If JSON parsing fails this function returns NULL and populates |error_msg_out| with a formatted error message.