Required a few build tweaks because GN check does not understand #ifdef includes. Bug: angleproject:3411 Change-Id: I1aa7b97626767e3dc973bfa55f5b2a511c806ec9 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1589148Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Commit-Queue: Jamie Madill <jmadill@chromium.org>
