Check both thickness and position in gm.

Previously only position was checked (twice).

Bug: skia:8755
Change-Id: Ic169a08723853dd0e69a160b3f34506e922f0736
Reviewed-on: https://skia-review.googlesource.com/c/191662
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
1 file changed