Adding BGRA as a video type.

This CL is a prerequisite for the capture module update CL. 
Review URL: http://webrtc-codereview.appspot.com/329021

git-svn-id: http://webrtc.googlecode.com/svn/trunk@1317 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed