title: Android app - Chrome extension communication
body: <p>I'm looking for some advice on the best way to have my Android app communicate with a Chrome extension where a user is signed into both with their Google account. Preferably I want to avoid having an intermediate server and rely on an existing service bus. </p>
  
  <p>I had assumed Google Cloud Messaging would fit the bill as it can be implemented in both Android and Chrome but it seems to stop short of allowing direct communication without a 3rd party server.</p>
  
  <p>Thanks.</p>