[skotty,sksg] Add support for geometry merge

TBR=
Change-Id: Ia5edbfeae61779ead6031f6dd4e33794b3eefdc0
Reviewed-on: https://skia-review.googlesource.com/90382
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
diff --git a/BUILD.gn b/BUILD.gn
index 8344b54..fe58f50 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1384,6 +1384,7 @@
       "experimental/sksg/SkSGPaintNode.cpp",
       "experimental/sksg/SkSGRenderNode.cpp",
       "experimental/sksg/effects/SkSGTransform.cpp",
+      "experimental/sksg/geometry/SkSGMerge.cpp",
       "experimental/sksg/geometry/SkSGPath.cpp",
       "experimental/sksg/geometry/SkSGRect.cpp",
       "experimental/sksg/paint/SkSGColor.cpp",