Add display task to trigger display configuration

ui/display/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/ui.gni")
 
 component("display") {
   sources = [
     "chromeos/configure_displays_task.cc",
     "chromeos/configure_displays_task.h",
     "chromeos/display_configurator.cc",
     "chromeos/display_configurator.h",
+    "chromeos/display_util.cc",
+    "chromeos/display_util.h",
     "chromeos/ozone/display_configurator_ozone.cc",
+    "chromeos/update_display_configuration_task.cc",
+    "chromeos/update_display_configuration_task.h",
     "chromeos/x11/display_configurator_x11.cc",
     "chromeos/x11/display_mode_x11.cc",
     "chromeos/x11/display_mode_x11.h",
     "chromeos/x11/display_snapshot_x11.cc",
     "chromeos/x11/display_snapshot_x11.h",
     "chromeos/x11/display_util_x11.cc",
     "chromeos/x11/display_util_x11.h",
     "chromeos/x11/native_display_delegate_x11.cc",
     "chromeos/x11/native_display_delegate_x11.h",
     "chromeos/x11/native_display_event_dispatcher_x11.cc",
@@ skipping 90 matching lines @@
     "//base",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 }
 
 test("display_unittests") {
   sources = [
     "chromeos/configure_displays_task_unittest.cc",
     "chromeos/display_configurator_unittest.cc",
+    "chromeos/update_display_configuration_task_unittest.cc",
     "chromeos/x11/display_util_x11_unittest.cc",
     "chromeos/x11/native_display_event_dispatcher_x11_unittest.cc",
     "util/display_util_unittest.cc",
     "util/edid_parser_unittest.cc",
   ]
 
   deps = [
     ":test_util",
     "//base",
     "//base/test:run_all_unittests",
@@ skipping 10 matching lines @@
     ]
   }
 
   if (use_ozone && is_chromeos) {
     sources -= [
       "chromeos/x11/display_util_x11_unittest.cc",
       "chromeos/x11/native_display_event_dispatcher_x11_unittest.cc",
     ]
   }
 }