Add a mojom/StructTrait for display::Display.

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 55 matching lines @@
     "//services/shell/public/interfaces",
     "//services/ui/common:mus_common",
     "//services/ui/gles2:lib",
     "//services/ui/public/cpp",
     "//services/ui/public/interfaces",
     "//skia",
     "//third_party/icu",
     "//ui/aura",
     "//ui/compositor",
     "//ui/display",
-    "//ui/display/mojo",
+    "//ui/display/mojo:type_converter",
     "//ui/events",
     "//ui/events:events_base",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gfx/geometry/mojo",
     "//ui/gl",
     "//ui/native_theme",
     "//ui/platform_window",
     "//ui/platform_window/mojo",
     "//ui/platform_window/mojo:interfaces_cpp_sources",
@@ skipping 215 matching lines @@
   type = "exe"
   application_name = "views_mus_unittests"
   source = "unittests_manifest.json"
 }
 
 mojo_application_manifest("interactive_ui_tests_manifest") {
   type = "exe"
   application_name = "views_mus_interactive_ui_tests"
   source = "interactive_ui_tests_manifest.json"
 }