Crop application windows to their stack bounds.

We don't want applications to put their content outside of the area
designated by their stacks. However, we don't want to affect their
frames or task bounds. Instead, we crop their surfaces to the bounds
so they don't extend outside of the stack.

Change-Id: I7231c4baa437eefaa6bd7ba89dbc3d5038496c46
1 file changed