4d4353ded9
This will allow it to be used by the nnbd_migration package. Change-Id: Ia628630cf156af7bbfdbe2e104254cf5a609ae91 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/144467 Reviewed-by: Samuel Rawlins <srawlins@google.com> Commit-Queue: Paul Berry <paulberry@google.com>