Just before r78556 the test was good: http://build.chromium.org/p/chromium.webkit/builders/Webkit%20Linux/builds/2250/steps/webkit_tests/logs/stdio After the change, it doesn't: http://build.chromium.org/p/chromium.webkit/builders/Webkit%20Linux/builds/2251/steps/webkit_tests/logs/stdio On Linux, no visible result is produced, only blank image: http://test-results.appspot.com/dashboards/flakiness_dashboard.html#showExpectations=true&group=%40ToT%20-%20chromium.org&tests=svg%2Fcustom%2Fuse-css-no-effect-on-shadow-tree.svg (make sure to click on "Show results" link).
Had just failed on Windows bot as well.
Created attachment 82463 [details] patch
http://trac.webkit.org/changeset/78568