Create sksl_small nanobench test.

This is the standard no-op shader that Viewer uses to blit the software
rasterizer's back-buffer to the screen. It modulates against white and
samples a texture using an identity matrix.

This gives us a realistic best-case-scenario test. `sksl_tiny` is too
small to be a realistic test (although it's a good data point to show
our ultimate speed-of-light).

Change-Id: Ic697cb1301752574ab63a9a0d7b07a0ff81c3a88
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/329476
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed