I am running the latest build of google chromium from ports chromium-52.0.2743.116 and after building it and launching chrome I get windows that look like this : http://imgur.com/M3kM9gv I've built chrome in the past and it worked without this bad rendering. One thing that has changed since then was update to the latest nvidia drivers and I now load nvidia-modeset instead of the old nvidia drivers. Loading nvidia driver my screen is garbled. I am not sure if these things are related.
*** This bug has been marked as a duplicate of bug 212060 ***