title: How to change rootElement when there is interaction of two apps
body: <p>I've a use case where it is to be automate  two different apps interaction in a jasmine suite.
  So two different apps  there would be different rootElement for two apps.
  How should we manage this rootElement. I've tried one setting in config.js and i can interact with first app url and then chnaged browser.rootEl = '[ng-app="muiApp"]';to interact second  app but it is not working .</p>
  
  <p>In a suite multipe specs involving interactions between the two apps</p>
  
  <p>Getting error:</p>
  
  <pre><code>Failed: Error while waiting for Protractor to sync with the page: "window.angular is undefined.  This could be either because this is a non-angular page or because your test involves client-side navigation, which can interfere with Protractor's bootstrapping.  See http://git.io/v4gXM for details"
  </code></pre>