Add GL headers to libGLESv2, libEGL and translator projects.

Change-Id: I66f36623eb5fb60fbb92d16af4f9854688b9484c
Reviewed-on: https://chromium-review.googlesource.com/185190
Tested-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Nicolas Capens <nicolascapens@chromium.org>
11 files changed