Merge "Store a group level noise metric from first pass."

diff --cc vp9/encoder/vp9_firstpass.c
Simple merge

diff --cc vp9/encoder/vp9_firstpass.h
index 5d9a7fd,d2490f9..d8a0a3b
--- 1/vp9/encoder/vp9_firstpass.h
--- 2/vp9/encoder/vp9_firstpass.h
+++ b/vp9/encoder/vp9_firstpass.h
@@@ -41,9 -41,10 +41,10 @@@ typedef struct 
  } FIRSTPASS_MB_STATS;
  #endif
  
 -#define INVALID_ROW -1
 +#define INVALID_ROW (-1)
  
  #define MAX_ARF_LAYERS 6
+ #define SECTION_NOISE_DEF 250.0
  
  typedef struct {
    double frame_mb_intra_factor;