Consolidate ui::NativeEvent and base::NativeEvent

base/event_types.h

Index: base/event_types.h
diff --git a/base/event_types.h b/base/event_types.h
new file mode 100644
index 0000000000000000000000000000000000000000..092ec7f33faf969cc8e03a22646d69cebf6b488d
--- /dev/null
+++ b/base/event_types.h
@@ -0,0 +1,37 @@
+// Copyright (c) 2011 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 BASE_EVENT_TYPES_H
+#define BASE_EVENT_TYPES_H
+#pragma once
+
+#include "build/build_config.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#endif
+
+#if defined(USE_X11)
+typedef union _XEvent XEvent;
+#endif
+
+namespace base {
+
+// Cross platform typedefs for native event types.
+#if defined(OS_WIN)
+typedef MSG NativeEvent;
+#elif defined(USE_X11)
+typedef XEvent* NativeEvent;
+#elif defined(USE_WAYLAND)
+// WaylandEvent is currently defined in ui component and cannot be
+// used in base component. Probably wayland maintainer has to move it
+// outside of ui in order to define NativeEvent for wayland here.
+typedef void* NativeEvent;
+#else
+typedef void* NativeEvent;
+#endif
+
+} // namespace base
+
+#endif  // BASE_EVENT_TYPES_H