New OnceUx Test Class CompanionAdTestCase.java

##Rationale
Now that Companion Ads have been implemented into the Sample App, It's time for tests.
##Changed Files
**CompanionAdTestCase.java**
* New utility methods
    * *companionCheck* finds the companion ad based on the companion ad frame's resource id
    * *toCompanionAdCheck(int msec)* navigates to the next ad break, then performs *companionCheck*. It returns the results of *companionCheck*.
    * *toEndOfAdBreak* navigates to the end of an ad break, hides the seek controls, and then performs *companionCheck*. It returns the results of *companionCheck*.
* New tests
    * **testCompanionAd** navigates through the video using *toCompanionAdCheck* and *toEndOfAdBreak*. After the start of each ad break, it asserts that the companion ad is present.
    * **testCompanionAdLink** clicks on a companion ad and tests for the presence of the browser url the click is meant to link to
    * **testCompanionAdVanish** navigates through the video using *toCompanionAdCheck* and *toEndOfAdBreak*, checking after the end of each ad break for the presence of a companion ad. It asserts that *toEndOfAdBreak* will return false for each ad break.
I'm OK with the standardization of using TAG.

The only reason I could think of to declare it in the Child classes, is if you wanted to differentiate somehow between a child-class method and a parent-class method within the same test run, but I'd think that highly unlikely.

Try it out with this small framework, and examine the results, is what I'd suggest here.