Update chromeos system menu buttons for MD.

ash/test/BUILD.gn

 # Copyright 2016 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")
 
 # Used to test ash with an aura backend.
 source_set("ash_with_aura_test_support") {
   testonly = true
   sources = [
@@ skipping 103 matching lines @@
     "test_shell_delegate.cc",
     "test_shell_delegate.h",
     "test_suite.cc",
     "test_suite.h",
     "test_suite_init.h",
     "test_suite_init.mm",
     "test_system_tray_item.cc",
     "test_system_tray_item.h",
     "test_wallpaper_delegate.cc",
     "test_wallpaper_delegate.h",
-    "tray_cast_test_api.cc",
-    "tray_cast_test_api.h",
     "ui_controls_factory_ash.cc",
     "ui_controls_factory_ash.h",
     "user_metrics_recorder_test_api.cc",
     "user_metrics_recorder_test_api.h",
   ]
   configs += [ "//build/config:precompiled_headers" ]
 
   public_deps = [
     "//ash",
     "//ui/display:display_manager_test_api",
@@ skipping 41 matching lines @@
     deps += [
       "//chromeos",
       "//ui/display",
     ]
 
     sources += [
       "../laser/laser_pointer_controller_test_api.cc",
       "../laser/laser_pointer_controller_test_api.h",
       "../laser/laser_pointer_points_test_api.cc",
       "../laser/laser_pointer_points_test_api.h",
+      "tray_cast_test_api.cc",
+      "tray_cast_test_api.h",
     ]
   }
 }
 
 static_library("interactive_ui_test_support") {
   testonly = true
   configs += [ "//build/config:precompiled_headers" ]
   public_deps = [
     ":test_support_without_content",
     "//ash",
   ]
   sources = [
     "ash_interactive_ui_test_base.cc",
     "ash_interactive_ui_test_base.h",
   ]
   deps = [
     ":test_support_with_content",
     "//base",
     "//skia",
     "//testing/gtest",
     "//ui/aura",
     "//ui/base",
     "//ui/gl:test_support",
   ]
 }