Google Now is behind an eponymous flag in chrome://flags in the last Chromium build (download-chromium.appspot.com).

Sadly, we still can't play with it yet because the Google Now server URL still remains secret.
If you know it though, all you have to do is set
localStorage['server_url'] = 'http://example.com'; in the background page.

Source: http://codereview.chromium.org/12508004/
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