Docserver: Round cron timing stats to whole seconds for printing. I'm seeing
logs like "took 9.53674316406e-07 seconds to resolve" which is just silly.

R=yoz@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/64313004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234246 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234246