Tune up tessellated stroke gms

* Make sure to actually use hardware tessellation on the *_tess_segs_5
  gms. These had started using the fixed count tessellator.

* Add a trickycubicstrokes version with round caps to test upcoming
  coverage AA modes.

* Make the colors more appealing since I spend all day looking at
  these gms.

Bug: skia:10419
Change-Id: Ie7ab4e936ffa3ccffe4999e51fac4c3d4ab97f06
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/406976
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
4 files changed