add font parameter to CanDrawAsDistanceFields

Bug: skia:
Change-Id: Ibb8ae6bcd43ffc768d5e1bf15790def6132739b0
Reviewed-on: https://skia-review.googlesource.com/c/174067
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Reed <reed@google.com>
4 files changed