requestData method

Future<String> requestData (String message, { Duration timeout })

Sends a string and returns a string.

This enables generic communication between the driver and the application. It's expected that the application has registered a DataHandler callback in enableFlutterDriverExtension that can successfully handle these requests.

Implementation 

Future<String> requestData(String message, { Duration timeout }) async {
  timeout ??= _shortTimeout(timeoutMultiplier);
  return RequestDataResult.fromJson(await _sendCommand(RequestData(message, timeout: timeout))).message;
}