Add cloud_print to the GN build.

cloud_print/virtual_driver/win/BUILD.gn

Index: cloud_print/virtual_driver/win/BUILD.gn
diff --git a/chrome/installer/launcher_support/BUILD.gn b/cloud_print/virtual_driver/win/BUILD.gn
similarity index 54%
copy from chrome/installer/launcher_support/BUILD.gn
copy to cloud_print/virtual_driver/win/BUILD.gn
index 9abab50df0aefabdc299b6795e0fee8f77ee83f2..3ed32ace03ae637b832213dcbfe5a8279969c3ea 100644
--- a/chrome/installer/launcher_support/BUILD.gn
+++ b/cloud_print/virtual_driver/win/BUILD.gn
@@ -1,14 +1,17 @@
 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
+# found in the LICENSE file.
 
-source_set("launcher_support") {
+source_set("win") {
   sources = [
-    "chrome_launcher_support.cc",
-    "chrome_launcher_support.h",
+    "virtual_driver_consts.cc",
+    "virtual_driver_consts.h",
+    "virtual_driver_helpers.cc",
+    "virtual_driver_helpers.h",
   ]
 
   deps = [
     "//base",
+    "//cloud_print/common",
   ]
 }