[HarfBuzz] query cvXX feature name table references

[Khaled Hosny]

On Mon, Apr 30, 2018 at 08:50:57PM +0700, Martin Hosken wrote:
> Dear Behdad,
> 
> Do you have any plans (pretty please) to add an API to enable a client
> to query a font to get hold of the name table references for the
> various cvXX features in a font?

See https://github.com/harfbuzz/harfbuzz/pull/976, may be you can
comment on the proposed API?

Regards,
Khaled