Convert GrConfigConversionEffect to a runtime FP

Change-Id: I7f22447cf3356b1558d73665ff3e9b61639ebe83
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/423576
Auto-Submit: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
12 files changed