Create mojom and StructTraits for ui/display/types/display_mode.cc

ui/ozone/BUILD.gn

Index: ui/ozone/BUILD.gn
diff --git a/ui/ozone/BUILD.gn b/ui/ozone/BUILD.gn
index b5746becf558ba6342010efb6ecd64e0d2c904dd..1343f247c2fc3c3bce77bfa763bbcfc2e236c9c2 100644
--- a/ui/ozone/BUILD.gn
+++ b/ui/ozone/BUILD.gn
@@ -214,13 +214,19 @@ action("generate_constructor_list") {
 
 test("ozone_unittests") {
   sources = [
+    "//ui/ozone/common/mojo/display_mode_params_struct_traits_unittest.cc",
     "run_all_unittests.cc",
   ]
 
   deps = [
+    "//base",
     "//base/test:test_support",
+    "//mojo/edk/system",
+    "//mojo/edk/test:test_support",
     "//testing/gtest",
     "//ui/gfx/geometry",
+    "//ui/ozone/common/mojo:test_ui_ozone_common_mojom_display_mode_params",
+    "//ui/ozone/common/mojo:ui_ozone_common_mojom_display_mode_params",
   ]
 
   # Add tests of platform internals.