compositing/iframes/invisible-nested-iframe-show.html, compositing/tiling/huge-layer-add-remove-child.html have been failing on Windows 7 Release (Tests) since r88581.
It looks like these failures started with http://trac.webkit.org/changeset/88580.
I am going to add the expected (failing?) results on Windows in order to get the bots green.
Added expected failing results in http://trac.webkit.org/changeset/88747.