Revert "Remove VideoSendStreamInput::PutFrame." This reverts r6229. Test WebRtcVideoChannel2BaseTest.MuteStream fails after r6229. BUG= R=stefan@webrtc.org TBR=mflodman@webrtc.org Review URL: https://webrtc-codereview.appspot.com/19529005 git-svn-id: http://webrtc.googlecode.com/svn/trunk@6230 4adac7df-926f-26a2-2b94-8c16560cd09d