Add additional fields to Schema which are mentioned in the spec but
do not affect validation.
Change-Id: I89488261a00c207d01cd7fc59d782f43692fe528
Reviewed-on: https://go-review.googlesource.com/c/tools/+/674976
Reviewed-by: Alan Donovan <adonovan@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Jonathan Amsterdam <jba@google.com>
