Convert stroke tessellation to using GrVertexWriter

Bug: chromium:1172543
Bug: skia:10419
Change-Id: Ie2d05b0d37e03e8cd3eb69c67da89c02ffa49ddb
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/367576
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/gn/gpu.gni b/gn/gpu.gni
index 2d5d2b1..b031f8c 100644
--- a/gn/gpu.gni
+++ b/gn/gpu.gni
@@ -270,6 +270,7 @@
   "$_src/gpu/GrUserStencilSettings.h",
   "$_src/gpu/GrUtil.cpp",
   "$_src/gpu/GrUtil.h",
+  "$_src/gpu/GrVertexWriter.h",
   "$_src/gpu/GrVx.h",
   "$_src/gpu/GrWaitRenderTask.cpp",
   "$_src/gpu/GrWaitRenderTask.h",