Don't reject stroked empty rrects in GPU backend

Bug: skia:8115
Change-Id: Icaedd332a77c530646e7c2a8687132d729c0ee76
Reviewed-on: https://skia-review.googlesource.com/138932
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
1 file changed