GrTextContext::Options -> GrSDFTOptions

Rename GrTextContext::Options to GrSDFTOptions. Remove GrTextContext.

TBR=reed@google.com

Change-Id: Ic89966cfe630cc6ee757977a6d63ae1da9e39ef0
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/296176
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
19 files changed