title: Search request in Chrome omnibox from an extension
body: <p>How can I execute a search request in Chrome's omnibox from an extension ?</p>
  
  <p>I'm looking for something similar to:</p>
  
  <pre><code>chrome.tabs.create({
      'url': 'some/relative/or/absolute/url'
  });
  </code></pre>
  
  <p>where the url can be any string and the behaviour is the same as typing the string in the omnibox.</p>
  
  <p>Thanks</p>