mash: Migrate wallpaper controllers to ash/common.

ash/mus/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("//build/config/ui.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//services/shell/public/cpp/service.gni")
 import("//services/shell/public/service_manifest.gni")
 import("//tools/grit/repack.gni")
 
@@ skipping 190 matching lines @@
   ]
 
   deps = [
     ":lib",
     ":resources",
     "//ash",
     "//ash:test_support_without_content",
     "//ash/public/interfaces",
     "//base",
     "//base/test:test_config",
+    "//base/test:test_support",
     "//mojo/public/cpp/system",
     "//services/shell/public/cpp:service_test_support",
     "//services/ui/common:mus_common",
     "//services/ui/public/cpp",
     "//services/ui/public/cpp/tests:test_support",
     "//services/ui/public/cpp/tests:unittest_support",
     "//services/ui/public/interfaces",
     "//skia",
     "//testing/gtest",
     "//ui/aura",
     "//ui/base",
     "//ui/base:test_support",
     "//ui/display",
     "//ui/events",
     "//ui/events:test_support",
     "//ui/gfx:test_support",
     "//ui/gfx/geometry",
     "//ui/gfx/geometry/mojo",
     "//ui/message_center",
     "//ui/views/mus",
   ]
 
   data_deps = [
     ":mus",
     "//mash/quick_launch",
   ]
 
   defines = [ "NOTIMPLEMENTED_POLICY=5" ]
 }