class FlatlandTouchIntegrationTest_SetHitRegion_CapturesTouch_Class

Creates a view tree of the form

root_view

|

parent_view

|

child_view

Parent and child each have a view ref, and the parent positions its hit region and its child like

so:

------------------------------------

| | |

| A | B |

| | |

|----------------------------------|

| | |

| C | D |

| | |

|----------------------------------|

where parent view occupies A, B, C, D,

and child view occupies A and C (the left-side half of the parent view),

and the parent view positions a hit region over C and D, which *covers* the child view.

The hit tests expected are:

- hit test in A should reach the child, due to the default hit region for the child.

- hit test in B should reach the parent, due to the default hit region for the parent.

- hit test in C and D should reach the parent, due to the parent's explicit hit region.