Merge "[svc] Temporal svc with two pass rate control"

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_temporal_filter.c
Simple merge

diff --cc vp9/vp9_cx_iface.c
Simple merge