Summary:
- Passing the `treeNodeIndexPath` from `FocusInfo` all the way to the `Tree` component.
- Using the index path to find the right node and give it a different visual appearance.
Reviewed By: kevin0571
Differential Revision: D23161057
fbshipit-source-id: 05a95444bb76c1f28a21b42bf477ed9c9929e3b1