libvpx: Pull from upstream

source/libvpx/vp9/common/vp9_alloccommon.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_COMMON_VP9_ALLOCCOMMON_H_
 #define VP9_COMMON_VP9_ALLOCCOMMON_H_
 
+#define INVALID_IDX -1  // Invalid buffer index.
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 struct VP9Common;
 
 void vp9_remove_common(struct VP9Common *cm);
 
 int vp9_alloc_context_buffers(struct VP9Common *cm, int width, int height);
 void vp9_init_context_buffers(struct VP9Common *cm);
 void vp9_free_context_buffers(struct VP9Common *cm);
 
-int vp9_alloc_ref_frame_buffers(struct VP9Common *cm, int width, int height);
 void vp9_free_ref_frame_buffers(struct VP9Common *cm);
 
 int vp9_alloc_state_buffers(struct VP9Common *cm, int width, int height);
 void vp9_free_state_buffers(struct VP9Common *cm);
 
 void vp9_set_mb_mi(struct VP9Common *cm, int width, int height);
 
 void vp9_swap_current_and_last_seg_map(struct VP9Common *cm);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // VP9_COMMON_VP9_ALLOCCOMMON_H_