Revert "Revert "use pathbuilder""

This reverts commit 43e3e91883c8599f5e379d53da8b5895cc17c238.

Change-Id: I43f6c195f96b1601225801ffaa05a3133c236eba
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/313421
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Reed <reed@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index d4dc462..98f940e 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1276,6 +1276,7 @@
     "src/core/SkOpts.cpp",
     "src/core/SkPaint.cpp",
     "src/core/SkPath.cpp",
+    "src/core/SkPathBuilder.cpp",
     "src/core/SkPathEffect.cpp",
     "src/core/SkPathMeasure.cpp",
     "src/core/SkPathRef.cpp",