The layout test compositing/geometry/composited-html-size.html when run within DRT / new-run-webkit-tests (--platform chromium-gpu) displays the text "compositing" in black, where this text is not visible in Safari's pixel results. This discrepancy likely indicates a bug which needs to be fixed.
LayoutTest failures for Chromium are being marked WontFix. The Bug is still accessible and referenced from TestExpectations.