The tests:
compositing/reflections/nested-reflection-anchor-point.html
compositing/reflections/nested-reflection-animated.html
compositing/reflections/nested-reflection-transition.html

appear to be flaky when run in random order. Steps to reproduce:

This should pass consistently:
Tools/Scripts/run-layout-tests compositing/reflections/

This should fail intermittently when run many times:
Tools/Scripts/run-layout-tests compositing/reflections/ --order=random

We're working on removing order dependency from Blink layout tests. More context here:
https://docs.google.com/document/d/11-628Ny6hY__kfIv__zVD0m3rA0OB9tQLLC_gJI_PNg/edit#