libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_rdopt.h

Index: source/libvpx/vp9/encoder/vp9_rdopt.h
diff --git a/source/libvpx/vp9/encoder/vp9_rdopt.h b/source/libvpx/vp9/encoder/vp9_rdopt.h
index 7bbc3c89a06d0a7591c87a3f19731bf762174c1e..459b0324bcf81b3c37d3b57e519425872a09ce50 100644
--- a/source/libvpx/vp9/encoder/vp9_rdopt.h
+++ b/source/libvpx/vp9/encoder/vp9_rdopt.h
@@ -29,6 +29,15 @@ void vp9_rd_pick_intra_mode_sb(struct VP9_COMP *cpi, struct macroblock *x,
                                struct RD_COST *rd_cost, BLOCK_SIZE bsize,
                                PICK_MODE_CONTEXT *ctx, int64_t best_rd);
 
+unsigned int vp9_get_sby_perpixel_variance(VP9_COMP *cpi,
+                                           const struct buf_2d *ref,
+                                           BLOCK_SIZE bs);
+#if CONFIG_VP9_HIGHBITDEPTH
+unsigned int vp9_high_get_sby_perpixel_variance(VP9_COMP *cpi,
+                                                const struct buf_2d *ref,
+                                                BLOCK_SIZE bs, int bd);
+#endif
+
 void vp9_rd_pick_inter_mode_sb(struct VP9_COMP *cpi,
                                struct TileDataEnc *tile_data,
                                struct macroblock *x,