libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_encodeframe.h

 /*
  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 
 #ifndef VP9_ENCODER_VP9_ENCODEFRAME_H_
 #define VP9_ENCODER_VP9_ENCODEFRAME_H_
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 struct macroblock;
 struct yv12_buffer_config;
 struct VP9_COMP;
 
+// Constants used in SOURCE_VAR_BASED_PARTITION
+#define VAR_HIST_MAX_BG_VAR 1000
+#define VAR_HIST_FACTOR 10
+#define VAR_HIST_BINS (VAR_HIST_MAX_BG_VAR / VAR_HIST_FACTOR + 1)
+#define VAR_HIST_LARGE_CUT_OFF 75
+#define VAR_HIST_SMALL_CUT_OFF 45
+
 void vp9_setup_src_planes(struct macroblock *x,
                           const struct yv12_buffer_config *src,
                           int mi_row, int mi_col);
 
 void vp9_encode_frame(struct VP9_COMP *cpi);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // VP9_ENCODER_VP9_ENCODEFRAME_H_