webanimations/accelerated-animation-single-keyframe.html is consistently timing out on windows since it was added in r261756. History: https://results.webkit.org/?suite=layout-tests&test=webanimations%2Faccelerated-animation-single-keyframe.html&platform=win&platform=WPE&platform=GTK
<rdar://problem/65230147>
Per the offline conversation with Antoine we are skipping this test on Windows for now: https://trac.webkit.org/changeset/264125/webkit