Verifies that toggling pointer-events correctly updates scrolling layers in compositor.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS isUsingCompositedScrolling(documentLayerTree) is false
PASS isUsingCompositedScrolling(documentLayerTree) is true
PASS successfullyParsed is true

TEST COMPLETE
It should be possible to scroll this div.