Validate per-vertex vertices data against effect in SkCanvas

Updates the vertices_data GM to work on the GPU backend, too. For now,
it still works on the CPU via the original hack.

Bug: skia:9984
Change-Id: I2e11bd01e3cc953d2837ecd6ca8b2305b060e5fc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/278857
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
3 files changed