Was incorrectly extending filtered frame area by duplicating the last pixel. This was necessary when this was used with color convert, but isn't needed for this application. Added comments to help clarify some buffer usage. Review URL: http://webrtc-codereview.appspot.com/84001 git-svn-id: http://webrtc.googlecode.com/svn/trunk@244 4adac7df-926f-26a2-2b94-8c16560cd09d