Rotate ads on a visibilitychange event #207
Merged
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This allows the ad placement to rotate when the tab regains focus after losing it subject to the normal ad rotation conditions:
When a tab loses focus, we send the view time immediately. If that time is less than 30s, then the ad will not immediately rotate when the tab comes back into focus. However, the view time will begin counting again (although it will not send the view time again). If the tab loses/regains focus again and the view time is then 30+, the ad will rotate.
This PR also cleaned up the event listeners a little bit and was a little more defensive in terms of clearing listeners automatically during ad rotation.