The following layout test is flaky on Mac10.6 fast/canvas/2d.text.draw.fill.maxWidth.gradient.html According to the flakiness dashboard, the test almost never passes on Mac10.6: http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=fast%2Fcanvas%2F2d.text.draw.fill.maxWidth.gradient.html