Constructs a new YamlStyleDiscovery.
\Drupal\Core\Extension\ModuleHandlerInterface $module_handler: The module handler.
\Drupal\Core\Cache\CacheBackendInterface $cache_backend: The cache backend.
\Drupal\Core\Extension\ThemeHandlerInterface $theme_handler: The theme handler.
public function __construct(ModuleHandlerInterface $module_handler, CacheBackendInterface $cache_backend, ThemeHandlerInterface $theme_handler) {
$this->moduleHandler = $module_handler;
$this->themeHandler = $theme_handler;
$this->cache = $cache_backend;
}