Publish the location of archived results dashboard.html to user.

When run-webkit-tests --enable-versioned-results is run the user doesn't know where the archived results are placed.
So the location has to be notified to the user.

Review URL: https://codereview.chromium.org/418173010

git-svn-id: svn://svn.chromium.org/blink/trunk@179632 bbb929c8-8fbe-4397-9dbb-9b2b20218538