title: Time.unscaledDeltaTime still counting even when app is in background
body: <p>I just use a generic code to count how long the player has been playing in the update function:</p>
  
  <pre><code>float time;
  
  void Update()
  {
      time += Time.unscaledDeltaTime;
  }
  </code></pre>
  
  <p>Here is the problem: </p>
  
  <p>When I press the home button on my android device or browse past applications the timer still counts. So if I wait a while in home or in other apps screen and come back to the game, the timer includes time even when I have been out of the app. The game state stays exactly how it was before but only the timer changes. </p>
  
  <p>What could be the reason and how can I prevent the timer from counting when the application does not have focus?</p>