libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_lookahead.h

Index: source/libvpx/vp9/encoder/vp9_lookahead.h
diff --git a/source/libvpx/vp9/encoder/vp9_lookahead.h b/source/libvpx/vp9/encoder/vp9_lookahead.h
index a33d3002e5bd1146eaf5d9fe9583ad40870b52c7..13820380ff40da773ad33fa6d214be9b805814a8 100644
--- a/source/libvpx/vp9/encoder/vp9_lookahead.h
+++ b/source/libvpx/vp9/encoder/vp9_lookahead.h
@@ -79,7 +79,11 @@ void vp9_lookahead_destroy(struct lookahead_ctx *ctx);
  * \param[in] active_map  Map that specifies which macroblock is active
  */
 int vp9_lookahead_push(struct lookahead_ctx *ctx, YV12_BUFFER_CONFIG *src,
-                       int64_t ts_start, int64_t ts_end, unsigned int flags);
+                       int64_t ts_start, int64_t ts_end,
+#if CONFIG_VP9_HIGHBITDEPTH
+                       int use_highbitdepth,
+#endif
+                       unsigned int flags);
 
 
 /**\brief Get the next source buffer to encode