Disable output swizzling from GrDisableColorXP This makes sure the final shader does not output a color. Bug: skia: Change-Id: I1e5299bb63391d6ff72598ed72fe4fb80b18fa07 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/206352 Commit-Queue: Chris Dalton <csmartdalton@google.com> Reviewed-by: Greg Daniel <egdaniel@google.com>