SkQP: Allow checking against nearby pixel's expectations.

Also more verbose logging.

Change-Id: Ib2d9e3074d155140f14ab8818a332ce926488b79
Reviewed-on: https://skia-review.googlesource.com/101543
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
2 files changed