Added system notification for update_engine.

chrome/browser/chromeos/cros/mock_update_library.h

Index: chrome/browser/chromeos/cros/mock_update_library.h
diff --git a/chrome/browser/chromeos/cros/mock_update_library.h b/chrome/browser/chromeos/cros/mock_update_library.h
new file mode 100644
index 0000000000000000000000000000000000000000..4e1e7f6d9281fd5461aae3a79fe3ac1debb6040f
--- /dev/null
+++ b/chrome/browser/chromeos/cros/mock_update_library.h
@@ -0,0 +1,30 @@
+// Copyright (c) 2010 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_CHROMEOS_CROS_MOCK_UPDATE_LIBRARY_H_
+#define CHROME_BROWSER_CHROMEOS_CROS_MOCK_UPDATE_LIBRARY_H_
+
+#include "base/observer_list.h"
+#include "chrome/browser/chromeos/cros/update_library.h"
+#include "testing/gmock/include/gmock/gmock.h"
+
+namespace chromeos {
+
+class MockUpdateLibrary : public UpdateLibrary {
+ public:
+  MockUpdateLibrary() {}
+  virtual ~MockUpdateLibrary() {}
+  MOCK_METHOD1(AddObserver, void(Observer*));  // NOLINT
+  MOCK_METHOD1(RemoveObserver, void(Observer*));  // NOLINT
+
+  MOCK_CONST_METHOD0(status, const Status&(void));
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MockUpdateLibrary);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_CROS_MOCK_UPDATE_LIBRARY_H_
+