/**
  * Notifies all the listeners that a new tab has been created.
  *
  * @param tab The tab that has been created.
  */
 private void notifyNewTabCreated(Tab tab) {
   for (TabModelSelectorObserver listener : mObservers) {
     listener.onNewTabCreated(tab);
   }
 }
 /**
  * Notifies all the listeners that the {@link TabModelSelector} or its {@link TabModel} has
  * changed.
  */
 protected void notifyChanged() {
   for (TabModelSelectorObserver listener : mObservers) {
     listener.onChange();
   }
 }