SkPDF: type3: more descriptor values

Also: add fXHeight to SkAdvancedTypefaceMetrics.h

Change-Id: I28314cf93ca9808216ee34c202a0fa9fc2ffe301
Reviewed-on: https://skia-review.googlesource.com/117155
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
2 files changed