Adding some additional OWNERS to ragel validator.
Adding some additional OWNERS to ragel validator.

BUG=None
TEST=None
R=ncbray@chromium.org

Review URL: https://codereview.chromium.org/1113273004

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client