Add a drawGlyphs to SkCanvas that takes SkRSXform instead of
positions. Update buffer sizing calculations to take
SkRSXform buffers into account.
Change-Id: I14529088199dcd0b1ae78b4605e1ba77fec2000e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/399096
Reviewed-by: Ben Wagner <bungeman@google.com>
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Herb Derby <herb@google.com>