Use display::DisplayMode in ozone/drm/gpu

ui/ozone/platform/drm/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/linux/pkg_config.gni")
 import("//ui/ozone/ozone.gni")
 
 visibility = [ "//ui/ozone/*" ]
 
 source_set("gbm") {
@@ skipping 128 matching lines @@
   ]
 
   public_configs = [ "//third_party/khronos:khronos_headers" ]
 
   defines = [ "OZONE_IMPLEMENTATION" ]
 }
 
 source_set("gbm_unittests") {
   testonly = true
   sources = [
+    "common/drm_util_unittest.cc",
     "gpu/drm_overlay_validator_unittest.cc",
     "gpu/drm_window_unittest.cc",
     "gpu/fake_plane_info.cc",
     "gpu/fake_plane_info.h",
     "gpu/hardware_display_controller_unittest.cc",
     "gpu/hardware_display_plane_manager_unittest.cc",
     "gpu/mock_drm_device.cc",
     "gpu/mock_drm_device.h",
     "gpu/mock_dumb_buffer_generator.cc",
     "gpu/mock_dumb_buffer_generator.h",
@@ skipping 10 matching lines @@
   deps = [
     ":gbm",
     "//skia",
     "//testing/gtest",
     "//third_party/libdrm",
     "//ui/gfx",
     "//ui/ozone:platform",
     "//ui/ozone/common",
   ]
 }