Yaowu Xu 76feb965d3 made vp8_mode_context adaptive
vp8_mode_contexts[] is an entropy table used to code inter mode
choices. It was a fixed constant table. This commit made the entropy
context adaptive. Tests on derf set showed very good consistent gains
on all metrics: avg psnr .47%, overall psnr .46% and ssim .40%.

http://www.corp.google.com/~yaowu/no_crawl/newModeContext.html

Change-Id: Ia62b14485c948e2b74586118619c5eb2068b43b2
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