Make aurademo create a command line and atexitmanager

These are generally needed by aura and other parts of the code.

BUG=none
TEST=none
R=ben@chromium.org

Review URL: https://codereview.chromium.org/134523004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244336 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244336