1 Verifies that toggling pointer-events correctly updates scrolling layers in compositor.
3 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
6 PASS isUsingCompositedScrolling(documentLayerTree) is false
7 PASS isUsingCompositedScrolling(documentLayerTree) is true
8 PASS successfullyParsed is true
11 It should be possible to scroll this div.