Merge "Adding a little more data to an exception." into sc-dev

        if (Float.isNaN(brightness) || brightness > 1.0f

                || (brightness < 0.0f && brightness != -1.0f)) {

            throw new IllegalArgumentException("brightness must be a number between 0.0f and 1.0f,"

                    + " or -1 to turn the backlight off.");

                    + " or -1 to turn the backlight off: " + brightness);

        }

        return nativeSetDisplayBrightness(displayToken, brightness);

    }