Clears the output device(s) display to the currently selected background
color.
@param This The protocol instance pointer.
@retval EFI_SUCCESS The operation completed successfully.
@retval EFI_DEVICE_ERROR The device had an error and could not complete the request.
@retval EFI_UNSUPPORTED The output device is not in a valid text mode.
Clears the output device(s) display to the currently selected background color.
@param This The protocol instance pointer.
@retval EFI_SUCCESS The operation completed successfully. @retval EFI_DEVICE_ERROR The device had an error and could not complete the request. @retval EFI_UNSUPPORTED The output device is not in a valid text mode.