Log the failures in run-webkit-test on an early exit.

R=ojan@chromium.org
BUG=371591

Review URL: https://codereview.chromium.org/277733002

git-svn-id: svn://svn.chromium.org/blink/trunk@173921 bbb929c8-8fbe-4397-9dbb-9b2b20218538