Publish the location of results.html to user in keyboard interrupt scenario.

In case of Ctrl+C (keyboard interrupt), results.html is generated but user
is never notified neither of its generation nor stored location of it. It
is not required in regular usecase because we open the browser window with
results.html loaded, but in other usecase it should be notified to atleast
let the user know the result is stored for him in case he wishes to see it.

R=dpranke

BUG=None

TEST=None

Review URL: https://codereview.chromium.org/27554003

git-svn-id: svn://svn.chromium.org/blink/trunk@160234 bbb929c8-8fbe-4397-9dbb-9b2b20218538