Allow the Views Delegate to provide the native widget.

ui/views/views_switches.h

Index: ui/views/views_switches.h
===================================================================
--- ui/views/views_switches.h	(revision 0)
+++ ui/views/views_switches.h	(revision 0)
@@ -0,0 +1,19 @@
+// Copyright (c) 2012 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_VIEWS_VIEWS_SWITCHES_H_
+#define UI_VIEWS_VIEWS_SWITCHES_H_
+
+#include "ui/views/views_export.h"
+
+namespace views {
+namespace switches {
+
+// Please keep alphabetized.
+VIEWS_EXPORT extern const char kWinAura[];
+
+}  // namespace switches
+}  // namespace views
+
+#endif  // UI_VIEWS_VIEWS_SWITCHES_H_