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libvpx

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Yunqing Wang
7c4992c4667
Yunqing Wang committed 7c7e4d4eb8d
vp9_ethread: allocate frame contexts outside VP9_COMMON struct

This patch allocated frame contexts outside VP9_COMMON. This allows
multiple threads to share the same copy of frame contexts, and
reduces the overhead. It also guarantees the correct update of
these contexts during bitstream packing. This patch doesn't change
encoding result.

Change-Id: Ic181a2460b891d1d587278a6d02d8057b9dbd353