title: Dropbox long polling for changes to one file (Javascript API)
body: <p>My application is only interested in changes that happen to one file in Dropbox. What is the easiest/most efficient way to watch for changes in that one file?</p>
  
  <p>I know there is a <a href="http://coffeedoc.info/github/dropbox/dropbox-js/master/classes/Dropbox/Client.html#pollForChanges-instance" rel="nofollow">long polling method</a>, but that looks like will fire events for any changes that the app has access to. My application requires access to the entire Dropbox account as the target file is chosen by the end user from anywhere in their account. Webhooks are also not an option as this is for a Chrome extension.</p>