fast/css/outline-auto-empty-rects.html started failing on Chromium Mac Release (Tests) between r92054 and r92059 (inclusive). http://trac.webkit.org/log/trunk?rev=92059&stop_rev=92054 http://build.webkit.org/results/Chromium%20Mac%20Release%20(Tests)/r92053%20(10044)/results.html passed http://build.webkit.org/results/Chromium%20Mac%20Release%20(Tests)/r92059%20(10048)/results.html failed Looking at the regression range, r92059 appears to be the cause. There's a curious "circle" appearing on the page after the patch was landed: http://build.webkit.org/results/Chromium%20Mac%20Release%20(Tests)/r92090%20(10074)/fast/css/outline-auto-empty-rects-diffs.html
LayoutTest failures for Chromium are being marked WontFix. The Bug is still accessible and referenced from TestExpectations.