Update VectorScalarMath test to run on GPU.

This shakes out a few driver issues.

Change-Id: I35041a904fb762a5b933b3e970f2d7a668803dcd
Bug: skia:12858, skia:11919
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/501019
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
3 files changed