[canvaskit] add a gm for testing particles

Bug: skia:10264
Change-Id: If005e49e9ea28936764346a126b7216f4e5289f4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/291199
Reviewed-by: Kevin Lubick <kjlubick@google.com>
1 file changed