Ignore local matrix when choosing CT uni type with explicit sampling.
Ignore local matrix when choosing CT uni type with explicit sampling.

The GP's local matrix is ignored when explicitly sampling FPs.

Add asserts to check consistency.

Change-Id: I6fc063e223affa3115f00eb63454ae5e6c1c27eb
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/278779
Reviewed-by: Ethan Nicholas <d2cfb8c2f603266f4dc3a6f09acbcc0089603b37@google.com>
Commit-Queue: Brian Salomon <61fabaaf0876044aeedfd8e351e485c028d69e7b@google.com>

aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia