This CL handles only the limited case of defaults on properties.
This is just a start: I need to think more about defaults on other
schema keywords, and I need to set defaults recursively.
As part of this work, I realized that the Schema.Default field is
more usable when represented as a json.RawMessage instead of a *any.
Change-Id: Iedcedb405b52607a312dbd895fa61e7f7f94c6bc
Reviewed-on: https://go-review.googlesource.com/c/tools/+/676938
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Auto-Submit: Jonathan Amsterdam <jba@google.com>
c5a3591742