Test computed style during the delay phase of an accelerated animation.

PASS - "-webkit-transform.4" property for "testbox" element at 0.1s saw something close to: 0
PASS - "-webkit-transform.4" property for "changedbox" element at 0.1s saw something close to: 50
PASS - "-webkit-transform.4" property for "filledbox" element at 0.1s saw something close to: 100