Add SkTypeface::getPostScriptName.

Bug: skia:10234
Change-Id: Idfa1261e36174a4b4223b8eb62c872448fc58b14
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/322680
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
20 files changed