Move emit functions from Poly/Vertex structs into GrTriangulator

Bug: skia:10419
Change-Id: I6351513b365a190dd97312a0b3d436a44b8fb10a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/351858
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
2 files changed