Implement LatencyInfo StructTraits

ui/events/mojo/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("//mojo/public/tools/bindings/mojom.gni")
+
 # GYP version: mojo/mojo_converters.gypi:mojo_input_events_lib
 component("mojo") {
   output_name = "input_events"
   sources = [
     "input_events_type_converters.cc",
     "mojo_extended_key_event_data.cc",
     "mojo_extended_key_event_data.h",
     "mojo_input_events_export.h",
   ]
 
   defines = [ "MOJO_INPUT_EVENTS_IMPLEMENTATION" ]
 
   deps = [
     "//base",
     "//components/mus/public/interfaces",
     "//mojo/public/c/system:for_component",
     "//ui/events",
     "//ui/events:dom_keycode_converter",
     "//ui/gfx/geometry",
     "//ui/gfx/geometry/mojo",
     "//ui/gfx/geometry/mojo",
   ]
 }
+
+mojom("interfaces") {
+  sources = [
+    "latency_info.mojom",
+  ]
+
+  public_deps = [
+    "//mojo/common:common_custom_types",
+  ]
+}
+
+mojom("test_interfaces") {
+  testonly = true
+  sources = [
+    "traits_test_service.mojom",
+  ]
+
+  public_deps = [
+    ":interfaces",
+  ]
+}