row/col methods

Change-Id: I5b306b15070899d0091b974b09869ff50dcd9c7e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/265980
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
2 files changed