Add local video tests.

Also, clean up playVideoTest - removes seemingly unnecessary signal handling
logic, and fixes check to onVideoSizeChangedCalled, as the size was being
changed before our call to wait(), leading us to wait until a 60 second
timeout was reached before proceeding with the test.

Change-Id: Ie4c42e8d66c13ac434b734f0a079620a1381c1b0