Add location provider name to gps-processing-method in EXIF header.

const char CameraParameters::KEY_GPS_LONGITUDE[] = "gps-longitude";

const char CameraParameters::KEY_GPS_ALTITUDE[] = "gps-altitude";

const char CameraParameters::KEY_GPS_TIMESTAMP[] = "gps-timestamp";

const char CameraParameters::KEY_GPS_PROCESSING_METHOD[] = "gps-processing-method";

const char CameraParameters::KEY_WHITE_BALANCE[] = "whitebalance";

const char CameraParameters::KEY_SUPPORTED_WHITE_BALANCE[] = "whitebalance-values";

const char CameraParameters::KEY_EFFECT[] = "effect";

    // stored in JPEG EXIF header.

    // Example value: "1251192757". Write only.

    static const char KEY_GPS_TIMESTAMP[];

    // GPS Processing Method

    // Example value: "GPS" or "NETWORK". Write only.

    static const char KEY_GPS_PROCESSING_METHOD[];

    // Current white balance setting.

    // Example value: "auto" or WHITE_BALANCE_XXX constants. Read/write.

    static const char KEY_WHITE_BALANCE[];