fix behavior for setTransform

Change-Id: Ie68587c90e411699bd88b13872df9aef1ec7c820
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/651577
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Auto-Submit: Jorge Betancourt <jmbetancourt@google.com>
2 files changed