Add new tests to trickycubicstrokes

Adds cusps and flat beziers with 180 degree turns that confuse the
new tessellator.

Bug: skia:10419
Change-Id: I2529780da596fe365c1d2825e29145beedf5cb01
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/312118
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
1 file changed