title: chrome extension API for refreshing the page
body: <p>Is there an API to programmatically refresh the current tab from inside a browser action button? I have background page configured, which attaches a listener via:</p>
  
  <pre><code>chrome.browserAction.onClicked.addListener(function(tab) { ... });
  </code></pre>
  
  <p>So the callback function retrieves a reference to the tab that it was clicked from, but I don't see an API anywhere to refresh/reload that tab.</p>