Use vertex writer for per-edge aa; remove templated tessellate function

Bug: skia:
Change-Id: I5e1014cea7bb869636e6c706f54a2145e58214fd
Reviewed-on: https://skia-review.googlesource.com/c/171229
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
5 files changed