Pull the triangulating path renderer's shape-space triangulation into a helper method

This functionality will also be needed in TriangulatingPathOp::onPrePrepareDraws

Bug: 1108408
Change-Id: I0bf3f3c14820b946f4c4bc738c55e7a5eb2e7ced
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/328556
Reviewed-by: Adlai Holler <adlai@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
1 file changed