Added myself to the mediaqueries watchlist

Since I'm responsible to many of the recent changes in media query parsing, I've added myself to the watchlist for that code.
I also added the 'parser/MediaQuery' path, to cover the new code.

BUG=

Review URL: https://codereview.chromium.org/221843002

git-svn-id: svn://svn.chromium.org/blink/trunk@170687 bbb929c8-8fbe-4397-9dbb-9b2b20218538