Added myself to 'css' watchlist.

TBR=eseidel
NOTRY=true
BUG=None

Review URL: https://codereview.chromium.org/150663008

git-svn-id: svn://svn.chromium.org/blink/trunk@166510 bbb929c8-8fbe-4397-9dbb-9b2b20218538