per-contour variant of SkPathMeasure

Bug: skia:8721
Change-Id: I1e79a49dee25ccc9138baf6fb2df3dc80d1ff66b
Reviewed-on: https://skia-review.googlesource.com/c/187922
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
9 files changed