Overrides \Drupal\Core\Config\Entity\ConfigStorageController::importUpdate().
Overrides ConfigStorageController::importUpdate
public function importUpdate($name, Config $new_config, Config $old_config) {
// Set a global value we can check in test code.
$GLOBALS['hook_config_import'] = __METHOD__;
return parent::importUpdate($name, $new_config, $old_config);
}