Use bulk advances in SkFont

Change-Id: I0a846baa2c82deef46583d2e67d862f65465a95f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/215099
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Herb Derby <herb@google.com>
1 file changed