Add feature support to shaper.

Change-Id: Iab8bf9ab144d1661c0653b617ca394c3663ab35c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/248861
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Julia Lavrova <jlavrova@google.com>
3 files changed