The test was added in r97487 (https://bugs.webkit.org/show_bug.cgi?id=68641). The results look oversized in Skia. Not sure why, cc'ing everyone who may care. http://test-results.appspot.com/dashboards/flakiness_dashboard.html#showExpectations=true&tests=fast%2Fcss%2Fclip-text-in-scaled-div.html
I moved the existing test results to the mac-specific platform directory with revision 97527.