Refactor notification operation functionality out of PNS

chrome/browser/notifications/notification_common.h

+// Copyright 2016 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 CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_COMMON_H_
+#define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_COMMON_H_
+
+namespace content {
+class BrowserContext;
+}  // namespace content
+
+// Shared functionality for both in page and persistent notification
+class NotificationCommon {
+ public:
+  // Things as user can do to a notification.
+  enum Operation {
+    CLICK = 0,
+    CLOSE = 1,
+    SETTINGS = 2
+  };
+
+  // Open the Notification settings screen when clicking the right button.
+  // TODO(miguelg) have it take a Profile instead once NotificationObjectProxy
+  // is updated.
+  static void OpenNotificationSettings(
+      content::BrowserContext* browser_context);
+};
+
+#endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_COMMON_H_