Make sure ReflexHash grid count is reasonable

Bug: chromium:888233
Change-Id: I42bea81d8dc6eee3516ed585f8bb838ef20ce554
Reviewed-on: https://skia-review.googlesource.com/156368
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
1 file changed