Consider rounded corners in occluded by (winscope)

The visible region calculation in the surface flinger doesn't consider that a layer with rounded corners can fully occlude another. Use the same behavior in flicker and winscope.

Bug: 174541970
Test: atest FlickerTests
Change-Id: Ie8e871a94b4413d2f02624c5738841d5d861bbbe
1 file changed