revise how we handle invalid configs

Move the contrast pin to Make() so it affects all implementations.

Bug: oss-fuzz:30859
Change-Id: Iaf7854701bc6a148976f653066d7bf8f27080d2f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/369698
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
2 files changed