Add kouhei to WATCHLISTS

NOTRY=true
BUG=None
TBR=abarth,haraken

Review URL: https://codereview.chromium.org/189443005

git-svn-id: svn://svn.chromium.org/blink/trunk@168694 bbb929c8-8fbe-4397-9dbb-9b2b20218538