tighten up SkSL parser depth testing

Bug: skia:
Change-Id: I459748b92a62da7b09a57a4b719d787bac897ebd
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/219617
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
1 file changed