message: Rendered tab bar item if multiple children
  Keeps it backward compatible, for example, the notifications tab in twitter sample has multiple children. Only need to render direct child for the TabBar inside CoordiatorLayout
diff: @@ -21,6 +21,6 @@ public class TabFragment extends Fragment {
  @Nullable
  @Override
  public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
  - return tabBarItem.getChildAt(0);
  + return tabBarItem.getChildCount() == 1 ? tabBarItem.getChildAt(0) : tabBarItem;
  }
  }
  