Add builder grid to unexpected failures tab.

R=abarth@chromium.org,ojan@chromium.org,esprehn@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/367853002

git-svn-id: svn://svn.chromium.org/blink/trunk@177604 bbb929c8-8fbe-4397-9dbb-9b2b20218538