Add test demonstrating that matrix/vector casts are considered trivial.

This version dodges skia:13380 by reordering the list of uniforms.
Disabled on Win10 with older Intel GPUs due to crashes when performing
vector/matrix casts in GLSL.

Change-Id: If053908fd1a6921257e5af0abdce1ff69a03297f
Bug: skia:13378, skia:12179
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/546551
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
4 files changed