Add private system extension API to get system update status

chrome/browser/chromeos/accessibility/accessibility_private_extension_api.h

+// 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 CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_ACCESSIBILITY_PRIVATE_EXTENSION_API_H_
+#define CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_ACCESSIBILITY_PRIVATE_EXTENSION_API_H_
+#pragma once
+
+#include "base/compiler_specific.h"
+#include "chrome/browser/extensions/extension_function.h"
+
+namespace chromeos {
+namespace accessibility {
+
+// API function that returns the status of system update.
+class GetUpdateStatusFunction : public SyncExtensionFunction {
+  virtual ~GetUpdateStatusFunction() {}
+  virtual bool RunImpl() OVERRIDE;
+  DECLARE_EXTENSION_FUNCTION_NAME(
+      "accessibilityPrivate.getUpdateStatus")
+};
+
+
+}  // namespace accessibility
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_ACCESSIBILITY_PRIVATE_EXTENSION_API_H_