sk_sp-ify GrGlyphCache

Hopefully, this makes it clearer that the subRuns of the GrAtlasTextBlobs carry a ref on the GrAtlasTextStrikes

Change-Id: I3d612074d98bc26240465f717711b7a2bcecb6ed
Reviewed-on: https://skia-review.googlesource.com/110981
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
10 files changed