SkTypeface: fix non-determinism on AdvacedMetrics

Calculate fStemV and fCapHeight using SkPaint in SkPDFFont if needed.

Change-Id: Iaf762e6c44178fac659dfe9fa312d0caed9138ae
Reviewed-on: https://skia-review.googlesource.com/21535
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
2 files changed