Improve conic Wang's formula correctness tests

- Treat randomly generated control points as pre-projected
- Use double-precision conic evaluation for "within tolerance" test.
  This allows us to test with larger magnitude control points (the
  SkConic/SkGeometry single-precision functions lose too much accuracy).

Bug: skia:10419
Change-Id: Iba0915dccb50131e1a1b28a7d556863497f636e9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/367057
Commit-Queue: Tyler Denniston <tdenniston@google.com>
Reviewed-by: Chris Dalton <csmartdalton@google.com>
1 file changed