diff -r 000000000000 -r 6474c204b198 media/libvpx/vp9/decoder/vp9_treereader.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/media/libvpx/vp9/decoder/vp9_treereader.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+/*
+ *  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_DECODER_VP9_TREEREADER_H_
+#define VP9_DECODER_VP9_TREEREADER_H_
+
+#include "vp9/common/vp9_treecoder.h"
+#include "vp9/decoder/vp9_dboolhuff.h"
+
+// Intent of tree data structure is to make decoding trivial.
+static int treed_read(vp9_reader *const r, /* !!! must return a 0 or 1 !!! */
+                      vp9_tree t,
+                      const vp9_prob *const p) {
+  register vp9_tree_index i = 0;
+
+  while ((i = t[ i + vp9_read(r, p[i >> 1])]) > 0)
+    continue;
+
+  return -i;
+}
+
+#endif  // VP9_DECODER_VP9_TREEREADER_H_