Track plugin input event latency

ui/events/latency_info_param_traits_macros.h

Index: ui/events/latency_info_param_traits_macros.h
diff --git a/ui/events/latency_info_param_traits_macros.h b/ui/events/latency_info_param_traits_macros.h
new file mode 100644
index 0000000000000000000000000000000000000000..84cbb03ac53ff7fef9c95ba02a0e9006e8f17d3b
--- /dev/null
+++ b/ui/events/latency_info_param_traits_macros.h
@@ -0,0 +1,22 @@
+// Copyright (c) 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.
+
+// No include guard. This file is intended to be reused in
+// "content/common/content_param_traits_macros.h" and
+// "ppapi/proxy/ppapi_messages.h"
+
+IPC_ENUM_TRAITS_MAX_VALUE(ui::LatencyComponentType,
+                          ui::LATENCY_COMPONENT_TYPE_LAST)
+
+IPC_STRUCT_TRAITS_BEGIN(ui::LatencyInfo::LatencyComponent)
+  IPC_STRUCT_TRAITS_MEMBER(sequence_number)
+  IPC_STRUCT_TRAITS_MEMBER(event_time)
+  IPC_STRUCT_TRAITS_MEMBER(event_count)
+IPC_STRUCT_TRAITS_END()
+
+IPC_STRUCT_TRAITS_BEGIN(ui::LatencyInfo)
+  IPC_STRUCT_TRAITS_MEMBER(latency_components)
+  IPC_STRUCT_TRAITS_MEMBER(trace_id)
+  IPC_STRUCT_TRAITS_MEMBER(terminated)
+IPC_STRUCT_TRAITS_END()