Add more GMs to test new CSS gradients

- Tile modes (looks good on both CPU and GPU)
- Many stops (triggers known failure on GPU where texture
  fallback path doesn't handle non-destination interpolated
  color space).

Bug: skia:13108
Change-Id: I01750f5fc8d04aacff5e9572cdc5000bbf382abf
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/606777
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
1 file changed