[TIMOB-17146] Android: $.theWindow.size execution time depends on something

<Alloy>
  <Window id="theWindow" class="container">
    <Label id="label1" left="10" top="10">0.0</Label>
    <Label id="label2" left="10" top="30">Interval: 0.0 ms</Label>
    
    <Button left="70" top="50" onClick="onButton">Change Interval</Button>
  </Window>     
</Alloy>

$.theWindow.open();

var interval = 100;

function step() {
  var beginTime = new Date().getTime();
  /////
  var size = $.theWindow.size;
  /////  
  var endTime = new Date().getTime();
  
  var executionTime = endTime - beginTime;
  $.label1.setText(executionTime);  
}

var timerId1 = setInterval(step, interval);

function updateLabel() {
  $.label2.setText('Interval: ' + interval + ' ms');
}

var timerId = setInterval(updateLabel, interval);

function onButton() {
  if (interval == 100) {
    interval = 1;
  }
  else if (interval == 1) {
    interval = 10;
  }
  else {
    interval = 100;
  }
  
  clearInterval(timerId);
  timerId = setInterval(updateLabel, interval);
}