mash: Fix ash_sysui crash on startup due to missing AppListShower

ash/mus/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")
 import("//mojo/public/mojo_application.gni")
 import("//mojo/public/mojo_application_manifest.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//tools/grit/repack.gni")
 
@@ skipping 22 matching lines @@
     "//components/mus/public/interfaces",
     "//components/user_manager",
     "//device/bluetooth",
     "//mash/wm/public/interfaces",
     "//mojo/common:common_base",
     "//mojo/converters/geometry",
     "//mojo/converters/input_events",
     "//mojo/services/tracing/public/cpp",
     "//mojo/shell/public/cpp",
     "//skia",
+    "//ui/app_list/shower",
     "//ui/aura",
     "//ui/events",
     "//ui/events/devices",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/keyboard:mojom",
     "//ui/message_center",
     "//ui/mojo/init",
     "//ui/platform_window/stub",
     "//ui/resources",
@@ skipping 26 matching lines @@
   deps = [
     ":lib",
     "//mojo/shell/public/cpp",
   ]
 
   data_deps = [
     ":manifest",
     "//components/mus",
   ]
 }