title: Espresso android automation tests - How to Access views of other application, opened by my application?
body: <p>I have a button in my app, that when clicked - opens dropbox login page on chrome.
  I'm trying to access the views in that opened chrome window to fill the fields and continue, but because that activity doesn't belong to my application, the views are not in the hierarchy tree.</p>
  
  <p>Anyone knows how to access external application views with espresso?</p>
  
  <p>I already tried with "UI-automator" and "espresso-web", but to no avail.</p>