[gn build] Port 24bb2d1e776
diff --git a/llvm/utils/gn/secondary/clang-tools-extra/clangd/refactor/tweaks/BUILD.gn b/llvm/utils/gn/secondary/clang-tools-extra/clangd/refactor/tweaks/BUILD.gn
index 993adce..687b872 100644
--- a/llvm/utils/gn/secondary/clang-tools-extra/clangd/refactor/tweaks/BUILD.gn
+++ b/llvm/utils/gn/secondary/clang-tools-extra/clangd/refactor/tweaks/BUILD.gn
@@ -12,6 +12,7 @@
   ]
   include_dirs = [ "../.." ]
   sources = [
+    "AddUsing.cpp",
     "AnnotateHighlightings.cpp",
     "DefineInline.cpp",
     "DefineOutline.cpp",