Define a set of variable COLRv1 variations tests

Based on glyph descriptions in [1].

[1] https://github.com/googlefonts/color-fonts/blob/main/glyph_descriptions.md

Bug: skia:13563
Change-Id: If748662d01a9ce293fea3f32a1dd312775b4c70b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/568237
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
Auto-Submit: Dominik Röttsches <drott@chromium.org>
1 file changed