Port EC test from Daala.
This currently only ports a small portion - the random encode/decode mixing CDFs and bools, plus the patch initial bits tests. The tests will break with a different CDF_PROB_TOP, as well as a different CDF_PROB_TOP between bools and CDFs. Change-Id: Ia289c6afd70cbc7dde5ed7a9c7c42f219c29935d
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