GN: Get os="chromeos" use_ozone=true to compile

ui/ozone/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("//ui/ozone/ozone.gni")
 
 # The list of platforms that will be built.
 ozone_platforms = []
 
 # Extra dependencies to pull into ui/ozone for built platforms.
@@ skipping 91 matching lines @@
   defines = [ "OZONE_IMPLEMENTATION" ]
 
   deps = [
     ":generate_constructor_list",
     ":generate_ozone_platform_list",
     ":ozone_base",
     "//base",
     "//ipc",
     "//skia",
     "//ui/display/types",
+    "//ui/display/util",
     "//ui/events",
     "//ui/events/ozone:events_ozone",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gfx/ipc",
     # TODO(GYP) the GYP version has a way to add additional dependencies via
     # build flags.
   ] + ozone_platform_deps
 
 }
@@ skipping 40 matching lines @@
 test("ozone_unittests") {
   sources = [
     "run_all_unittests.cc",
   ]
 
   deps = [
     "//base/test:test_support",
     "//testing/gtest",
   ] + ozone_platform_test_deps
 }