This is EA's base macro definitions package, re-constucted from the partial releases which EA have made at http://gpl.ea.com.
This repo was put together by Kitsilano Software in the hope that EA will fork it back, and start maintaining these releases in a form which is actually usable, rather than just meeting the bare-bones legal and technical requirement to get EAWebKit buildable.
See http://bobsummerwill.wordpress.com/2014/06/25/ea-open-source-software/.
Bob Summerwill, Kitsilano Software, July 2014.