8159690: [TESTBUG] Mark headful tests with @key headful.Reviewed-by: simonis, alexsch
8150844: [hidpi] [macosx] -Dsun.java2d.uiScale should be taken into account for OS XReviewed-by: serb, avstepan
8150724: [TEST] HiDPI: create a test for multiresolution iconsReviewed-by: alexsch, yan