accf607b3e0c98cf0c16314bbf258fa1ed581aa8

1) added support for two additional modes: -3/4 spatial down-sampling -2/3 frame rate reduction 2) updated unittest and added a few more tests 3) some code refactoring Review URL: https://webrtc-codereview.appspot.com/429005 git-svn-id: http://webrtc.googlecode.com/svn/trunk@1854 4adac7df-926f-26a2-2b94-8c16560cd09d
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