Add test for automatically disabling padding when no video is being captured.

BUG=2648
TEST=trybots
R=pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/4329004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5169 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed