|  | // Copyright 2013 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 EXTENSIONS_BROWSER_UPDATE_OBSERVER_H_ | 
|  | #define EXTENSIONS_BROWSER_UPDATE_OBSERVER_H_ | 
|  |  | 
|  | #include <string> | 
|  |  | 
|  | namespace extensions { | 
|  | class Extension; | 
|  |  | 
|  | class UpdateObserver { | 
|  | public: | 
|  | // Invoked when an app update is available. | 
|  | virtual void OnAppUpdateAvailable(const Extension* extension) = 0; | 
|  |  | 
|  | // Invoked when Chrome update is available. | 
|  | virtual void OnChromeUpdateAvailable() = 0; | 
|  |  | 
|  | protected: | 
|  | virtual ~UpdateObserver() {} | 
|  | }; | 
|  |  | 
|  | }  // namespace extensions | 
|  |  | 
|  | #endif  // EXTENSIONS_BROWSER_UPDATE_OBSERVER_H_ |