public static @Nullable CefApp getCefApp() {
      if (ourCefApp == null && CefApp.getState() != CefApp.CefAppState.NONE) {
        ourCefApp = CefApp.getInstance();
        //noinspection unchecked,rawtypes
        clientsField = new FieldAccessor(CefApp.class, "clients_", HashSet.class);
        //noinspection unchecked,rawtypes
        browsersField = new FieldAccessor(CefClient.class, "browser_", ConcurrentHashMap.class);
      }
      return ourCefApp;
    }
public static @Nullable CefApp getCefApp()