libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_speed_features.h

Index: source/libvpx/vp9/encoder/vp9_speed_features.h
===================================================================
--- source/libvpx/vp9/encoder/vp9_speed_features.h	(revision 290053)
+++ source/libvpx/vp9/encoder/vp9_speed_features.h	(working copy)
@@ -286,6 +286,10 @@
   // Chessboard pattern prediction filter type search
   int cb_pred_filter_search;
 
+  int cb_partition_search;
+
+  int motion_field_mode_search;
+
   // Fast quantization process path
   int use_quant_fp;
 
@@ -305,9 +309,6 @@
   // defined in the MODE_SEARCH_SKIP_HEURISTICS enum
   unsigned int mode_search_skip_flags;
 
-  // A source variance threshold below which the split mode is disabled
-  unsigned int disable_split_var_thresh;
-
   // A source variance threshold below which filter search is disabled
   // Choose a very large value (UINT_MAX) to use 8-tap always
   unsigned int disable_filter_search_var_thresh;