Branches and tags may change out from under us or disappear entirely.
Also add a presubmit check to prevent regressing.
Change-Id: I73878907d9a72f7de7b50989919c3a7bc385abf9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/229490
Reviewed-by: Ben Wagner aka dogben <benjaminwagner@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
