The css3/masking/mask-svg-clipped-fragmentId.html layout test is failing since it was added on r177494 (https://trac.webkit.org/changeset/177494). The diff is the following: https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20%28Tests%29/r180552%20%286443%29/css3/masking/mask-svg-clipped-fragmentId-diff.png