Support multiple default font families

Change-Id: I79da6b47bad97968b54f8b0288c65c037998d19b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/375316
Reviewed-by: Julia Lavrova <jlavrova@google.com>
Commit-Queue: Jason Simmons <jsimmons@google.com>
2 files changed