This is for the failures in layout/base/tests/test_frame_reconstruction_for_pseudo_elements.html This test checks that, when we change an attribute of an element, which leads to change to color property, there wouldn't be any frame reconstruction happens for ::first-line and ::after pseudo-elements. I'm not sure about the exact condition of this issue, though. cc bz and emilio since your work seems to be related to this.
Yes, this is all broken right now. We need to fix bug 1324618 and bug 1324619. Working on it now, in fact.