Convert StrokeTessellators to use PatchWriter

Bug: skia:12524
Change-Id: I99ade4b9f4fd442d9ddaa51651faf47321c06a5b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/474296
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
11 files changed