Roll HarfBuzz from 368e9578 to 6f190943 (313 commits)

https://chromium.googlesource.com/external/github.com/harfbuzz/harfbuzz.git/+log/368e9578873798e2d17ed78a0474dec7d4e9d6c0..6f1909439862cc37246aba55a85c0a072b945dff

With HarfBuzz past 3.0.0 the subsetter API is now public and stable.

Also add a roll script to ease rolling.

Change-Id: I206b54a38321e8887bdaee5778079b4d0e560ba9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/453097
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
2 files changed