hide hinting and flag enums with PAINT_FLAGS A preflight for https://skia-review.googlesource.com/c/skia/+/185460 Bug: skia:2664 Change-Id: I83f7f9cd500e8507b559462835477ba8ae7c11ab Reviewed-on: https://skia-review.googlesource.com/c/185540 Reviewed-by: Mike Reed <reed@google.com> Commit-Queue: Mike Reed <reed@google.com> Auto-Submit: Mike Reed <reed@google.com>