Make ProcessorOptimizationValidationTest more forgiving

Bug: skia:
Change-Id: I3ff965644a0a59af1e2a2b1ea226a1417a234ced
Reviewed-on: https://skia-review.googlesource.com/c/158342
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
1 file changed