Add private system extension API to get system update status

chrome/common/extensions/extension_permission_set_unittest.cc

Index: chrome/common/extensions/extension_permission_set_unittest.cc
diff --git a/chrome/common/extensions/extension_permission_set_unittest.cc b/chrome/common/extensions/extension_permission_set_unittest.cc
index bb15f841d424ac6a8b3d923d98378033e5e1ec19..2247b83a38e154e0105c93beb429377e97306cd8 100644
--- a/chrome/common/extensions/extension_permission_set_unittest.cc
+++ b/chrome/common/extensions/extension_permission_set_unittest.cc
@@ -168,6 +168,7 @@ TEST(ExtensionAPIPermissionTest, HostedAppPermissions) {
 TEST(ExtensionAPIPermissionTest, ComponentOnlyPermissions) {
   ExtensionPermissionsInfo* info = ExtensionPermissionsInfo::GetInstance();
   ExtensionAPIPermissionSet private_perms;
+  private_perms.insert(ExtensionAPIPermission::kAccessibilityPrivate);
   private_perms.insert(ExtensionAPIPermission::kChromeAuthPrivate);
   private_perms.insert(ExtensionAPIPermission::kChromeosInfoPrivate);
   private_perms.insert(ExtensionAPIPermission::kFileBrowserPrivate);
@@ -644,6 +645,7 @@ TEST(ExtensionPermissionSetTest, PermissionMessages) {
   skip.insert(ExtensionAPIPermission::kChromeosInfoPrivate);
   skip.insert(ExtensionAPIPermission::kWebSocketProxyPrivate);
   skip.insert(ExtensionAPIPermission::kInputMethodPrivate);
+  skip.insert(ExtensionAPIPermission::kAccessibilityPrivate);
 
   // Warned as part of host permissions.
   skip.insert(ExtensionAPIPermission::kDevtools);