mus: Show USER_PRIVATE window container during views tests

ui/views/mus/BUILD.gn

 # Copyright 2014 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("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//mojo/public/mojo_application.gni")
 import("//mojo/public/mojo_application_manifest.gni")
 import("//testing/test.gni")
 import("//tools/grit/repack.gni")
@@ skipping 126 matching lines @@
     "../views_test_suite.cc",
     "../views_test_suite.h",
     "views_mus_test_suite.cc",
     "views_mus_test_suite.h",
   ]
 
   deps = [
     ":mus",
     "//base",
     "//base/test:test_support",
+    "//components/mus/common:mus_common",
     "//services/shell/background:lib",
     "//services/shell/background/tests:test_support",
     "//services/shell/public/cpp:sources",
     "//testing/gtest",
     "//ui/aura",
     "//ui/gl:test_support",
     "//ui/resources",
     "//ui/resources:ui_test_pak",
     "//ui/views",
     "//ui/views:test_support_internal",
@@ skipping 146 matching lines @@
 }
 
 group("for_component") {
   public_deps = [
     ":mus",
   ]
   deps = [
     "//mojo/gles2",
   ]
 }