Fix mac TSAN build

Change-Id: If0eabff73f6de8877d8eb7444bc1f1d75a1b578c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/263708
Commit-Queue: Brian Salomon <bsalomon@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
1 file changed