libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_write_bit_buffer.h

 /*
  *  Copyright (c) 2013 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_WRITE_BIT_BUFFER_H_
 #define VP9_ENCODER_VP9_WRITE_BIT_BUFFER_H_
 
-#include <limits.h>
-
 #include "vpx/vpx_integer.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 struct vp9_write_bit_buffer {
   uint8_t *bit_buffer;
   size_t bit_offset;
 };
 
-size_t vp9_rb_bytes_written(struct vp9_write_bit_buffer *wb);
+size_t vp9_wb_bytes_written(const struct vp9_write_bit_buffer *wb);
 
 void vp9_wb_write_bit(struct vp9_write_bit_buffer *wb, int bit);
 
 void vp9_wb_write_literal(struct vp9_write_bit_buffer *wb, int data, int bits);
 
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // VP9_ENCODER_VP9_WRITE_BIT_BUFFER_H_