fast/repaint/obscured-background-no-repaint.html fails most of the time on first run: http://webkit-test-results.appspot.com/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Frepaint%2Fobscured-background-no-repaint.html
-PASS repaintRects is ""
+FAIL repaintRects should be . Was (repaint rects
+ (rect 50 558 16 16)
+ (rect 50 226 16 16)
+ (rect 8 84 100 100)
+ (rect 8 284 214 232)
Not sure when this started, it's been happening for as long as flakiness dashboard remembers (earliest recorded occurrence on March 18th).
Marked as flaky in <http://trac.webkit.org/r167068>.
This test fails in WK1 on OS X Yosemite in the same way, so I'll move the expectation from mac-wk2 to mac.
Should we just delete the test if we are not going to fix it?