Adding LatencyInfo to mojom::Event.

ui/events/mojo/event_struct_traits.h

 // Copyright 2016 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.
 
 #ifndef UI_EVENTS_MOJO_EVENT_STRUCT_TRAITS_H_
 #define UI_EVENTS_MOJO_EVENT_STRUCT_TRAITS_H_
 
 #include "ui/events/mojo/event.mojom.h"
 
 namespace ui {
 class Event;
+class LatencyInfo;
 }
 
 namespace mojo {
 
 using EventUniquePtr = std::unique_ptr<ui::Event>;
 
 template <>
 struct StructTraits<ui::mojom::EventDataView, EventUniquePtr> {
   static ui::mojom::EventType action(const EventUniquePtr& event);
   static int32_t flags(const EventUniquePtr& event);
   static int64_t time_stamp(const EventUniquePtr& event);
+  static const ui::LatencyInfo& latency(const EventUniquePtr& event);
   static ui::mojom::KeyDataPtr key_data(const EventUniquePtr& event);
   static ui::mojom::PointerDataPtr pointer_data(const EventUniquePtr& event);
   static bool Read(ui::mojom::EventDataView r, EventUniquePtr* out);
 };
 
 }  // namespace mojo
 
 #endif  // UI_EVENTS_MOJO_EVENT_STRUCT_TRAITS_H_