use font instead of paint

Bug: skia:
Change-Id: I82b0b37c8e7b295df62cefb4053dcfeba1521e27
Reviewed-on: https://skia-review.googlesource.com/c/177803
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
7 files changed