Add unit test to prevent future memory regressions

Bug: b/138674523
Change-Id: Ie4e37763ca68c7fcfa2f78cfa3c85a21bb863f77
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/233558
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
2 files changed