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diff --git a/content/public/browser/notification_observer.h b/content/public/browser/notification_observer.h
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+++ b/content/public/browser/notification_observer.h
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+// 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 CONTENT_PUBLIC_BROWSER_NOTIFICATION_OBSERVER_H_
+#define CONTENT_PUBLIC_BROWSER_NOTIFICATION_OBSERVER_H_
+#pragma once
+
+#include "content/common/content_export.h"
+
+namespace content {
+
+class NotificationDetails;
+class NotificationSource;
+
+// This is the base class for notification observers. When a matching
+// notification is posted to the notification service, Observe is called.
+class CONTENT_EXPORT NotificationObserver {
+ public:
+  NotificationObserver() {}
+  virtual ~NotificationObserver() {}
+
+  virtual void Observe(int type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details) = 0;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_NOTIFICATION_OBSERVER_H_