AppRTCDemo(android): added a Heads-Up Display for bandwidth estimation.
- tap display to toggle visibility
- increased getStats frequency to 1hz.

R=glaznev@google.com

Review URL: https://webrtc-codereview.appspot.com/19419004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6039 4adac7df-926f-26a2-2b94-8c16560cd09d
Roll libvpx 264320:267596

BUG=3038
R=niklas.enbom@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/14409004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6040 4adac7df-926f-26a2-2b94-8c16560cd09d