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diff --git a/third_party/aom/test/md5_helper.h b/third_party/aom/test/md5_helper.h
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+++ b/third_party/aom/test/md5_helper.h
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+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#ifndef AOM_TEST_MD5_HELPER_H_
+#define AOM_TEST_MD5_HELPER_H_
+
+#include "aom/aom_decoder.h"
+#include "common/md5_utils.h"
+
+namespace libaom_test {
+class MD5 {
+ public:
+  MD5() { MD5Init(&md5_); }
+
+  void Add(const aom_image_t *img) {
+    for (int plane = 0; plane < 3; ++plane) {
+      const uint8_t *buf = img->planes[plane];
+      // Calculate the width and height to do the md5 check. For the chroma
+      // plane, we never want to round down and thus skip a pixel so if
+      // we are shifting by 1 (chroma_shift) we add 1 before doing the shift.
+      // This works only for chroma_shift of 0 and 1.
+      const int bytes_per_sample =
+          (img->fmt & AOM_IMG_FMT_HIGHBITDEPTH) ? 2 : 1;
+      const int h =
+          plane ? (img->d_h + img->y_chroma_shift) >> img->y_chroma_shift
+                : img->d_h;
+      const int w =
+          (plane ? (img->d_w + img->x_chroma_shift) >> img->x_chroma_shift
+                 : img->d_w) *
+          bytes_per_sample;
+
+      for (int y = 0; y < h; ++y) {
+        MD5Update(&md5_, buf, w);
+        buf += img->stride[plane];
+      }
+    }
+  }
+
+  void Add(const uint8_t *data, size_t size) {
+    MD5Update(&md5_, data, static_cast<uint32_t>(size));
+  }
+
+  const char *Get() {
+    static const char hex[16] = {
+      '0', '1', '2', '3', '4', '5', '6', '7',
+      '8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
+    };
+    uint8_t tmp[16];
+    MD5Context ctx_tmp = md5_;
+
+    MD5Final(tmp, &ctx_tmp);
+    for (int i = 0; i < 16; i++) {
+      res_[i * 2 + 0] = hex[tmp[i] >> 4];
+      res_[i * 2 + 1] = hex[tmp[i] & 0xf];
+    }
+    res_[32] = 0;
+
+    return res_;
+  }
+
+ protected:
+  char res_[33];
+  MD5Context md5_;
+};
+
+}  // namespace libaom_test
+
+#endif  // AOM_TEST_MD5_HELPER_H_