Fix the size of the handle and touch area.

Set the touch region correctly, including corners, divider and handle.
Also increases the size of the handle.

Fix: 377960322
Test: manual + existing tests
Flag: com.android.window.flags.enable_tile_resizing

Change-Id: I148e9b0117c0205fea71eef6bf9d4f042227ac4d
4 files changed