Add get_glyphIDs and get_packedIDs

Change-Id: I60d7dfa4200054087270e106eb33503dee872690
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/648576
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Herb Derby <herb@google.com>
1 file changed