Some compositing/reflections tests fail on Windows. Right now the set is: compositing/reflections/animation-inside-reflection.html compositing/reflections/nested-reflection-animated.html See the URL for the diffs. I've added these tests to the Skipped list.
Perhaps caused by bug 32451?
Note that compositing/reflections/nested-reflection-animated.html sometimes succeeds (e.g., <http://build.webkit.org/results/Windows%20Release%20(Tests)/r70664%20(5675)/results.html>).
<rdar://problem/8601082>
As of 2014, these tests pass consistently.