libvpx: Pull from upstream

source/libvpx/vp8/encoder/onyx_if.c

Index: source/libvpx/vp8/encoder/onyx_if.c
diff --git a/source/libvpx/vp8/encoder/onyx_if.c b/source/libvpx/vp8/encoder/onyx_if.c
index 41b30663a8d8ab9d76b60ad1dcefc7545e636921..53d9fbbde6d3df7f0b35df68721c89decfd19d62 100644
--- a/source/libvpx/vp8/encoder/onyx_if.c
+++ b/source/libvpx/vp8/encoder/onyx_if.c
@@ -11,6 +11,7 @@
 
 #include "vpx_config.h"
 #include "./vpx_scale_rtcd.h"
+#include "./vp8_rtcd.h"
 #include "vp8/common/onyxc_int.h"
 #include "vp8/common/blockd.h"
 #include "onyx_int.h"
@@ -1760,8 +1761,16 @@ void vp8_change_config(VP8_COMP *cpi, VP8_CONFIG *oxcf)
         reset_temporal_layer_change(cpi, oxcf, prev_number_of_layers);
     }
 
+    if (!cpi->initial_width)
+    {
+        cpi->initial_width = cpi->oxcf.Width;
+        cpi->initial_height = cpi->oxcf.Height;
+    }
+
     cm->Width       = cpi->oxcf.Width;
     cm->Height      = cpi->oxcf.Height;
+    assert(cm->Width <= cpi->initial_width);
+    assert(cm->Height <= cpi->initial_height);
 
     /* TODO(jkoleszar): if an internal spatial resampling is active,
      * and we downsize the input image, maybe we should clear the