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>