libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_ratectrl.h

Index: source/libvpx/vp9/encoder/vp9_ratectrl.h
diff --git a/source/libvpx/vp9/encoder/vp9_ratectrl.h b/source/libvpx/vp9/encoder/vp9_ratectrl.h
index f9b0488bb3473a13029b6d4106c59e685dad6f96..11dfa35c3cdb073d747eab3d5f18b27c235ad83d 100644
--- a/source/libvpx/vp9/encoder/vp9_ratectrl.h
+++ b/source/libvpx/vp9/encoder/vp9_ratectrl.h
@@ -142,6 +142,9 @@ typedef struct {
   int frame_width[FRAME_SCALE_STEPS];
   int frame_height[FRAME_SCALE_STEPS];
   int rf_level_maxq[RATE_FACTOR_LEVELS];
+
+  uint64_t avg_source_sad;
+  int high_source_sad;
 } RATE_CONTROL;
 
 struct VP9_COMP;
@@ -256,6 +259,10 @@ void vp9_set_target_rate(struct VP9_COMP *cpi);
 
 int vp9_resize_one_pass_cbr(struct VP9_COMP *cpi);
 
+void vp9_avg_source_sad(struct VP9_COMP *cpi);
+
+int vp9_encodedframe_overshoot(struct VP9_COMP *cpi, int frame_size, int *q);
+
 #ifdef __cplusplus
 }  // extern "C"
 #endif