The following layout test fails on GTK since it was added on r169689 <http://trac.webkit.org/changeset/169689> svg/masking/mask-transformed-text-missing.svg [ ImageOnlyFailure ] The diffs are here: http://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20%28Tests%29/r169689%20%28681%29/svg/masking/
This started to pass after the freetype upgrade in r221670
<rdar://problem/34814294>