fast/scrolling/arrow-key-scroll-in-rtl-document.html is a flaky failure.
According to the Dashboard it is flaky on Both Sierra and El Capitan Debug WK2.
This was supposedly fixed in a previous bug and patch but has since become more frequent. There doesn't seem to be a recent regression point.
The failure is the same as the previous bug as well.
@@ -1 +1 @@
-PASS: scrollLeft is -120
+FAIL: scrollLeft is 0, expected -120
Marked as flaky on Sierra Debug Wk2:
This has become flaky on High Sierra as well: