The new tests introduced in Bug 142608 fail on all non-Mac platforms. Looking at the image differences, it doesn't look like these other platforms are anywhere close to doing the right thing. This needs to be reviewed and corrected.
Tests skipped in r182300 <https://trac.webkit.org/changeset/182300>.
We should just move these to platform/mac
See https://bugs.webkit.org/show_bug.cgi?id=143378
For completeness, we moved the the ruby tests from LayoutTests/fast/ruby to LayoutTests/platform/mac in <http://trac.webkit.org/changeset/184899> (bug #145336).