per-contour variant of SkPathMeasure

Bug: skia:8721
Change-Id: I1e79a49dee25ccc9138baf6fb2df3dc80d1ff66b
Reviewed-on: https://skia-review.googlesource.com/c/187922
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index 497587b..23f8ba8 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1093,6 +1093,7 @@
   sources += [
     "src/core/SkAnalyticEdge.cpp",
     "src/core/SkArenaAlloc.cpp",
+    "src/core/SkContourMeasure.cpp",
     "src/core/SkCubicMap.cpp",
     "src/core/SkEdge.cpp",
     "src/core/SkEdgeBuilder.cpp",