SkPDF: simplify subsetting code

move all compile-time logic into src/pdf/SkPDFFont.cpp

Change-Id: Ic983065ba7ab7f9e108e03b0065db8f4735ab9ca
Reviewed-on: https://skia-review.googlesource.com/c/192830
Commit-Queue: Ben Wagner <bungeman@google.com>
Auto-Submit: Hal Canary <halcanary@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
3 files changed