1) code cleanup and some updates to selection logic for qm_select. 2) added unit test for the QmResolution class. 3) update codec frame size and reset/update frame rate in media-opt: 4) removed unused motion vector metrics and some related code of content metrics processing. Review URL: https://webrtc-codereview.appspot.com/405008 git-svn-id: http://webrtc.googlecode.com/svn/trunk@1791 4adac7df-926f-26a2-2b94-8c16560cd09d