libvpx: Add VP9 decoder.

source/libvpx/vpx_scale/vpxscale.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 VPXSCALE_H
 #define VPXSCALE_H
 
 #include "vpx_scale/yv12config.h"
 
-extern void vp8_yv12_scale_or_center(YV12_BUFFER_CONFIG *src_yuv_config,
-                                     YV12_BUFFER_CONFIG *dst_yuv_config,
-                                     int expanded_frame_width,
-                                     int expanded_frame_height,
-                                     int scaling_mode,
-                                     int HScale,
-                                     int HRatio,
-                                     int VScale,
-                                     int VRatio);
-
 extern void vp8_scale_frame(YV12_BUFFER_CONFIG *src,
                             YV12_BUFFER_CONFIG *dst,
                             unsigned char *temp_area,
                             unsigned char temp_height,
                             unsigned int hscale,
                             unsigned int hratio,
                             unsigned int vscale,
                             unsigned int vratio,
                             unsigned int interlaced);
 
 #endif