[skif] Update SkShaderImageFilter to use FilterResult

Bug: skia:9282
Bug: b/263134493
Bug: oss-fuzz:59022
Change-Id: I059330de6f601c44ae375e94f0370478e0352352
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/697099
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
9 files changed