fix addOval and addRRect on builder

Need to notify the underlying pathref if we've made oval or rrect

Bug: skia:9000
Change-Id: I57a801f1fb446b99634d7b028249a812a5a978f1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/307516
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
5 files changed