views: Add an Options enum to MessageBoxView control.

ui/base/javascript_message_type.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 UI_BASE_JAVASCRIPT_MESSAGE_TYPE_H_
+#define UI_BASE_JAVASCRIPT_MESSAGE_TYPE_H_
+#pragma once
+
+#include "ui/base/ui_export.h"
+
+namespace ui {
+
+enum UI_EXPORT JavascriptMessageType {
+  JAVASCRIPT_MESSAGE_TYPE_ALERT,
+  JAVASCRIPT_MESSAGE_TYPE_CONFIRM,
+  JAVASCRIPT_MESSAGE_TYPE_PROMPT
+};
+
+}  // namespace ui
+
+#endif  // UI_BASE_JAVASCRIPT_MESSAGE_TYPE_H_