move supportBilerpAtlas to DirectMaskSubRun
move supportBilerpAtlas to DirectMaskSubRun

This reduces the reliance on the fBlob to only
initialPositionMatrix.

Change-Id: I92728ef0bec998a1c154642abfe139baceca7b6e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/502299
Reviewed-by: Robert Phillips <95e8ac5504948c7bf91b22c16a8dbb7ae7c66bfd@google.com>
Commit-Queue: Herb Derby <9e12a3d2bbf73546e47cc9958f6ba8f3215b7eaf@google.com>

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