Consider rounded corners in occluded by (tests)

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: Ia18f49495d911e17c6493eb5344beb02a4a190e7
1 file changed