Correct positioning of incoming video view.

There were a few things going on:
1. There is a case where we could try to position the incoming video view
before the call card has been fully laid out and its height is known.
2. When querying the height of the video surface, the getHeight() method
does not always return the value that was just set on it.  Using the
layout params solves this problem.
3. Cleaned up some other comments and debug statements.

Bug: 21444300
Change-Id: I9b59b132d6d4c7559497c6499b164598e7a75c7f