Add chroma 2x2 block experiment
Support the use of 2x2 prediction and transform block size for chroma components. This experiment builds on top of cb4x4. It brings back the loss in performance gains due to 4x4 chroma component constrain. The coding gains for lowres are up from 1.5% to 2.5%. Change-Id: I8e461e230c2d920f6df1af9d935ebe9dfa3820d9
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