Expose invisible windows from WindowInfosListenerForTest

This is useful for tests that adds an transparent overlay and wait for
its readiness.

Bug: 226803477
Test: CtsWindowManagerDeviceTestCases:SurfaceControlViewHostTests CtsWindowManagerDeviceTestCases:WindowInputTests
Change-Id: I59ede5a38b729c756abc32fd682ef2d132098533
2 files changed