gn build: Merge r375483

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375484 91177308-0d34-0410-b5e6-96231b3b80d8

utils/gn/secondary/clang/lib/Tooling/DependencyScanning/BUILD.gn

@@ -17,6 +17,7 @@ static_library("DependencyScanning") {
   sources = [
     "DependencyScanningFilesystem.cpp",
     "DependencyScanningService.cpp",
+    "DependencyScanningTool.cpp",
     "DependencyScanningWorker.cpp",
   ]
 }