update gm to test 2 unclipped layers

BUG=skia:

Change-Id: I98dedcfc52c9a22169264fb465d60aad72b7515f
Reviewed-on: https://skia-review.googlesource.com/8408
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed