Funtion to say if an SkFont has anti aliasing.

This will be used in a couple of places in the glyph painter,
best they all agree.

Change-Id: I67079b000bdede437de8fdc0a09538593775ab41
Reviewed-on: https://skia-review.googlesource.com/c/177000
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Ravi Mistry <rmistry@google.com>
3 files changed