Adjust how GM::gpuSetup is handled in the tools

Change-Id: I7a49ff49030b4c8aba1f0798a3742641030fe44f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/298710
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
11 files changed