The previous skeleton was name NSGL because it seemed the easier route
to go, however Chrome uses CGL internally, which we want to match.

BUG=angleproject:891

Change-Id: I00eb597080c8b735545750dfcd6ad80dcea79300
Reviewed-on: https://chromium-review.googlesource.com/289870Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Corentin Wallez <cwallez@chromium.org>