Skip should-not-repaint-composited-descendants.html on all platforms

BUG=365865
TBR=wangxianzhu@chromium.org
NOTRY=true
NOTREECHECKS=true

Review URL: https://codereview.chromium.org/247573005

git-svn-id: svn://svn.chromium.org/blink/trunk@172178 bbb929c8-8fbe-4397-9dbb-9b2b20218538