Don't assume extended (check perspective)

Related to https://skia-review.googlesource.com/c/skia/+/436476

Change-Id: Ief81b5f1824b5dd7960e09a1a6df55bcf6b6dc45
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/436597
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
2 files changed