Add discard check when deciding if we should execute op list or not.

Bug: skia:7828
Change-Id: I339ba64b6312cd9444cd4faffd426d91852774e9
Reviewed-on: https://skia-review.googlesource.com/122784
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2 files changed