Work on Windows GN component build.

gpu/config/BUILD.gn

Index: gpu/config/BUILD.gn
diff --git a/gpu/config/BUILD.gn b/gpu/config/BUILD.gn
index f94935837c076f7291c926eb51bb786f12d12c38..add90ecd4f039838200738e7f7c4402ddb100a35 100644
--- a/gpu/config/BUILD.gn
+++ b/gpu/config/BUILD.gn
@@ -9,7 +9,21 @@ declare_args() {
   use_libpci = true
 }
 
-source_set("config") {
+group("config") {
+  if (is_component_build) {
+    public_deps = [
+      "//gpu",
+    ]
+  } else {
+    public_deps = [
+      ":config_sources",
+    ]
+  }
+}
+
+source_set("config_sources") {
+  visibility = [ "//gpu/*" ]
+
   sources = [
     "dx_diag_node.cc",
     "dx_diag_node.h",
@@ -52,7 +66,7 @@ source_set("config") {
 
   deps = [
     "//base",
-    "//gpu/command_buffer/service",
+    "//gpu/command_buffer/service:service_sources",
     "//third_party/re2",
     "//ui/gl",
   ]