http://test-results.appspot.com/dashboards/flakiness_dashboard.html#showExpectations=true&group=%40ToT%20GPU%20Mesa%20-%20chromium.org&tests=fast%2Fcanvas%2Fcanvas-text-alignment.html I'm going to mark the test as failing in debug for now.
Err, that was the wrong link, http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=inspector%2Fstyles%2Fundo-add-new-rule.html
Disabled in http://trac.webkit.org/changeset/107602 .
*** This bug has been marked as a duplicate of bug 78502 ***