Add a new constructor to KeyEvent.

views/native_types.h

 // 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 VIEWS_NATIVE_TYPES_H_
 #define VIEWS_NATIVE_TYPES_H_
 #pragma once
 
 #include "ui/gfx/native_widget_types.h"
 
+#if defined(OS_LINUX)
+typedef union _GdkEvent GdkEvent;
+#endif
+#if defined(TOUCH_UI)
+typedef union _XEvent XEvent;
+#endif
+
 namespace views {
 
+// A note about NativeEvent and NativeEvent2.
+// 1. Eventually TOOLKIT_VIEWS will converge on using XEvent as we remove
+//    Gtk/Gdk from the stack.
+// 2. TOUCH_UI needs XEvents now for certain event types.
+// 3. TOUCH_UI also needs GdkEvents for certain event types.
+//
+//    => NativeEvent and NativeEvent2.
+//
+// Once we replace usage of Gtk/Gdk types with Xlib types across the board in
+// views, we can remove NativeEvent2 and typedef XEvent* to NativeEvent. The
+// world will then be beautiful(ish).
+
 #if defined(OS_WIN)
 typedef MSG NativeEvent;
 #endif
 #if defined(OS_LINUX)
-typedef union _GdkEvent GdkEvent;
 typedef GdkEvent* NativeEvent;
 #endif
 #if defined(TOUCH_UI)
-typedef union _XEvent XEvent;
-typedef XEvent* NativeEvent;
+typedef XEvent* NativeEvent2;
+#else
+typedef void* NativeEvent2;
 #endif
 
 }  // namespace views
 
 #endif  // VIEWS_NATIVE_TYPES_H_