Notificaitons refactor step 2

ui/message_center/notification_types.h

+// 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_MESSAGE_CENTER_NOTIFICATION_TYPES_H_
+#define UI_MESSAGE_CENTER_NOTIFICATION_TYPES_H_
+
+
+#include <string>
+
+#include "ui/message_center/message_center_export.h"
+
+namespace message_center {
+
+// Keys for optional fields in Notification.
+MESSAGE_CENTER_EXPORT extern const char kPriorityKey[];
+MESSAGE_CENTER_EXPORT extern const char kTimestampKey[];
+MESSAGE_CENTER_EXPORT extern const char kUnreadCountKey[];
+MESSAGE_CENTER_EXPORT extern const char kButtonOneTitleKey[];
+MESSAGE_CENTER_EXPORT extern const char kButtonOneIconUrlKey[];
+MESSAGE_CENTER_EXPORT extern const char kButtonTwoTitleKey[];
+MESSAGE_CENTER_EXPORT extern const char kButtonTwoIconUrlKey[];
+MESSAGE_CENTER_EXPORT extern const char kExpandedMessageKey[];
+MESSAGE_CENTER_EXPORT extern const char kImageUrlKey[];
+MESSAGE_CENTER_EXPORT extern const char kItemsKey[];
+MESSAGE_CENTER_EXPORT extern const char kItemTitleKey[];
+MESSAGE_CENTER_EXPORT extern const char kItemMessageKey[];
+
+enum NotificationType {
+  NOTIFICATION_TYPE_SIMPLE,
+  NOTIFICATION_TYPE_BASE_FORMAT,
+  NOTIFICATION_TYPE_IMAGE,
+  NOTIFICATION_TYPE_MULTIPLE,
+};
+
+enum NotificationPriority {
+  MIN_PRIORITY = -2,
+  LOW_PRIORITY = -1,
+  DEFAULT_PRIORITY = 0,
+  HIGH_PRIORITY = 1,
+  MAX_PRIORITY = 2,
+};
+
+}  // namespace message_center
+
+#endif // UI_MESSAGE_CENTER_NOTIFICATION_TYPES_H_