Working on AdOverlayCountdown.java
##Rationale
A new test that ensures that the video's current time corresponds to the Ad Countdown's time left in the video is being constructed. During work, a more stedfast and resolute version of the concrete version of the super.playVideo method was created.
##Changed Files
AdOverlayCountDown.java
* new test method testAdOverlayCountDown() that navigates through the video and sets up a loop, checking the ad overlay every second.
* new utility method currentTimeSeconds that gathers the current time and returns it as an int
* new utility method adTimeSeconds that gathers the ad overlay time and returns it as an int
* new boolean utility method intComparison that compares the two ints, and if they add up to 29, 30 or 31, returns true. Otherwise it returns false.
OnceUxUiAutomatorBase.java
* changed playVideo() method to wait for UiObjects.