Add Eric Carlson to 'track' and 'media' WATCHLISTS

This is on request from Eric, <video> implementor at Apple.

BUG=none

Review URL: https://codereview.chromium.org/144593002

git-svn-id: svn://svn.chromium.org/blink/trunk@165612 bbb929c8-8fbe-4397-9dbb-9b2b20218538