title: Acro JS : hostContainer.postMessage is not working in Chrome and Firefox
body: <p>I am trying to send a message from a html page to an embedded PDF by using hostContainer.postMessage API from Acrobat Javascript API.
  This works in IE9 but it does not work in Chrome and Firefox.
  I have tried by disabling their own PDF viewer and enabling acrobat reader and still it does not work.</p>
  
  <p>Does anyone face this issue?</p>
  
  <p>Thanks</p>