http://test-results.appspot.com/dashboards/flakiness_dashboard.html#showExpectations=true&group=%40ToT%20-%20chromium.org&tests=fullscreen%2Ffull-screen-stacking-context.html The test is introduced at http://trac.webkit.org/changeset/85811. I'll mark it PASS at this time.
It seems Mac port doesn't show control parts on fullscreen but chromium does. I have no idea if it is expected.
LayoutTest failures for Chromium are being marked WontFix. The Bug is still accessible and referenced from TestExpectations.