diff -r 000000000000 -r 6474c204b198 media/libvpx/vp9/common/vp9_treecoder.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/media/libvpx/vp9/common/vp9_treecoder.c	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,64 @@
+/*
+ *  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.
+ */
+
+
+#include <assert.h>
+
+#include "./vpx_config.h"
+#include "vp9/common/vp9_treecoder.h"
+
+static void tree2tok(struct vp9_token *const p, vp9_tree t,
+                    int i, int v, int l) {
+  v += v;
+  ++l;
+
+  do {
+    const vp9_tree_index j = t[i++];
+
+    if (j <= 0) {
+      p[-j].value = v;
+      p[-j].len = l;
+    } else {
+      tree2tok(p, t, j, v, l);
+    }
+  } while (++v & 1);
+}
+
+void vp9_tokens_from_tree(struct vp9_token *p, vp9_tree t) {
+  tree2tok(p, t, 0, 0, 0);
+}
+
+static unsigned int convert_distribution(unsigned int i, vp9_tree tree,
+                                         unsigned int branch_ct[][2],
+                                         const unsigned int num_events[]) {
+  unsigned int left, right;
+
+  if (tree[i] <= 0)
+    left = num_events[-tree[i]];
+  else
+    left = convert_distribution(tree[i], tree, branch_ct, num_events);
+
+  if (tree[i + 1] <= 0)
+    right = num_events[-tree[i + 1]];
+  else
+    right = convert_distribution(tree[i + 1], tree, branch_ct, num_events);
+
+  branch_ct[i >> 1][0] = left;
+  branch_ct[i >> 1][1] = right;
+  return left + right;
+}
+
+void vp9_tree_probs_from_distribution(vp9_tree tree,
+                                      unsigned int branch_ct[/* n-1 */][2],
+                                      const unsigned int num_events[/* n */]) {
+  convert_distribution(0, tree, branch_ct, num_events);
+}
+
+