Build more ANGLE files
Created attachment 369567 [details] Patch
This will be needed for https://bugs.webkit.org/show_bug.cgi?id=197755
Note that there are important steps to take when updating ANGLE. See http://trac.webkit.org/wiki/UpdatingANGLE
http://trac.webkit.org/r245248
<rdar://problem/50735811>