http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=animations%2Fcross-fade-border-image-source.html&showExpectations=true
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=transitions%2Fcross-fade-border-image.html&showExpectations=true
Several flaky layout tests have been seen which appear to be related to compositing. Unfortunately these failures seem to be difficult to reproduce locally. See also https://bugs.webkit.org/show_bug.cgi?id=74050 .
The last of these expectations was removed in r124296.