Merge "add a new interp filter search strategy."

diff --cc vp9/encoder/vp9_bitstream.c
Simple merge

diff --cc vp9/encoder/vp9_encoder.c
Simple merge

diff --cc vp9/encoder/vp9_encoder.h
Simple merge

diff --cc vp9/encoder/vp9_rdopt.c
Simple merge

diff --cc vp9/encoder/vp9_speed_features.c
Simple merge