Add myself to public/OWNERS

As suggested at https://codereview.chromium.org/637103002/#msg9

BUG=None

Review URL: https://codereview.chromium.org/651433002

git-svn-id: svn://svn.chromium.org/blink/trunk@183567 bbb929c8-8fbe-4397-9dbb-9b2b20218538