libvpx: Pull from upstream

source/libvpx/vpx_scale/yv12config.h

Index: source/libvpx/vpx_scale/yv12config.h
===================================================================
--- source/libvpx/vpx_scale/yv12config.h	(revision 240950)
+++ source/libvpx/vpx_scale/yv12config.h	(working copy)
@@ -15,6 +15,7 @@
 extern "C" {
 #endif
 
+#include "vpx/vpx_external_frame_buffer.h"
 #include "vpx/vpx_integer.h"
 
 #define VP8BORDERINPIXELS       32
@@ -64,9 +65,20 @@
   int vp9_alloc_frame_buffer(YV12_BUFFER_CONFIG *ybf,
                              int width, int height, int ss_x, int ss_y,
                              int border);
+
+  // Updates the yv12 buffer config with the frame buffer. If ext_fb is not
+  // NULL then libvpx is using external frame buffers. The function will
+  // check if the frame buffer is big enough to fit the decoded frame and
+  // try to reallocate the frame buffer. If ext_fb is not NULL and the frame
+  // buffer is not big enough libvpx will call cb with minimum size in bytes.
+  //
+  // Returns 0 on success. Returns < 0 on failure.
   int vp9_realloc_frame_buffer(YV12_BUFFER_CONFIG *ybf,
                                int width, int height, int ss_x, int ss_y,
-                               int border);
+                               int border,
+                               vpx_codec_frame_buffer_t *ext_fb,
+                               vpx_realloc_frame_buffer_cb_fn_t cb,
+                               void *user_priv);
   int vp9_free_frame_buffer(YV12_BUFFER_CONFIG *ybf);
 
 #ifdef __cplusplus