title: AnimatorSet with setStartDelay call to onAnimationStart
body: <p>I'm using android KitKat and this seems to be not working as expected. I have an AnimatiorSet which should start after some delay but I want to make some action when the animation actually starts (after the delay). It seems that AnimatorSet invokes onAnimationStarted on listeners immediately after calling start().</p>
  
  <p>Sample code below:</p>
  
  <pre><code>AnimatorSet set = new AnimatorSet();
  set.playTogether(
       ObjectAnimator.ofFloat(obj, "x", 10),
       ObjectAnimator.ofFloat(obj, "y", 10));
  set.setStartDelay(5000);
  set.setDuration(1000)
  
  set.addListener(new AnimatorListenerAdapter()
  {
      @Override
      public void onAnimationStart(Animator animation)
      {
          // do sth
      }
  });
  
  set.start();
  </code></pre>
  
  <p>In this case the listener is invoked immediately instead of delayed. To work around this issue I checked if adding the listener to the animators passed into playTogether gives the expected result and it actually does. Is this a bug?</p>