Convert gm to use pathbuilder

https://issues.skia.org/issues/445202439

Change-Id: Ic901a2481bab7530a88d9ec8c50cfa75abf59a35
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1055736
Reviewed-by: Kaylee Lubick <kjlubick@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Mike Reed <mike@reedtribe.org>
1 file changed