SkQP:  do test filtering correctly

PLEASE NOTE: Instructions for running a single test have changed!

No-Try: true
Change-Id: I1923240e879daa7ff0556737ddd5aa3f58e0097c
Reviewed-on: https://skia-review.googlesource.com/109566
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Derek Sollenberger <djsollen@google.com>
4 files changed