Add private system extension API to get system update status

chrome/common/extensions/extension_permission_set.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_COMMON_EXTENSIONS_EXTENSION_PERMISSION_SET_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_PERMISSION_SET_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 72 matching lines @@
 // The ExtensionAPIPermission is an immutable class that describes a single
 // named permission (API permission).
 class ExtensionAPIPermission {
  public:
   enum ID {
     // Error codes.
     kInvalid = -2,
     kUnknown = -1,
 
     // Real permissions.
+    kAccessibilityPrivate,
     kBackground,
     kBookmark,
     kChromeAuthPrivate,
     kChromePrivate,
     kChromeosInfoPrivate,
     kClipboardRead,
     kClipboardWrite,
     kContentSettings,
     kContextMenus,
     kCookie,
@@ skipping 324 matching lines @@
 
   // The list of hosts that can be scripted by content scripts.
   // TODO(jstritar): Rename to "user_script_hosts_"?
   URLPatternSet scriptable_hosts_;
 
   // The list of hosts this effectively grants access to.
   URLPatternSet effective_hosts_;
 };
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_PERMISSION_SET_H_