Convert GrStrikeCache to sk_sp<GrTextStrike>

Change-Id: I3f198c67dd271ff008f0696a012ed652ad5b37b8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/260038
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
2 files changed