mus: Show USER_PRIVATE window container during views tests

components/mus/common/BUILD.gn

 # 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.
 
 import("//testing/test.gni")
 
 component("mus_common") {
   sources = [
-    "args.cc",
-    "args.h",
     "event_matcher_util.cc",
     "event_matcher_util.h",
     "event_param_traits.cc",
     "event_param_traits.h",
     "event_param_traits_macros.h",
     "mus_common_export.h",
+    "switches.cc",
+    "switches.h",
     "transient_window_utils.h",
     "types.h",
     "util.h",
   ]
 
   defines = [ "MUS_IPC_IMPLEMENTATION" ]
 
   deps = [
     "//components/mus/public/interfaces",
     "//gpu/ipc/common:command_buffer_traits",
@@ skipping 20 matching lines @@
     "//base/test:run_all_unittests",
     "//base/test:test_config",
     "//ipc:ipc",
     "//mojo/edk/test:test_support",
     "//testing/gtest",
     "//ui/events:events",
     "//ui/gfx:test_support",
     "//ui/gfx/ipc",
   ]
 }