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diff --git a/accel/subsample_entry.h b/accel/subsample_entry.h
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+++ b/accel/subsample_entry.h
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+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+// Note: ported from Chromium commit head: 7014d6d
+
+#ifndef SUBSAMPLE_ENTRY_H_
+#define SUBSAMPLE_ENTRY_H_
+
+#include <stdint.h>
+
+namespace media {
+
+// The Common Encryption spec provides for subsample encryption, where portions
+// of a sample are set in cleartext. A SubsampleEntry specifies the number of
+// clear and encrypted bytes in each subsample. For decryption, all of the
+// encrypted bytes in a sample should be considered a single logical stream,
+// regardless of how they are divided into subsamples, and the clear bytes
+// should not be considered as part of decryption. This is logically equivalent
+// to concatenating all 'cypher_bytes' portions of subsamples, decrypting that
+// result, and then copying each byte from the decrypted block over the
+// position of the corresponding encrypted byte.
+struct SubsampleEntry {
+  SubsampleEntry() : clear_bytes(0), cypher_bytes(0) {}
+  SubsampleEntry(uint32_t clear_bytes, uint32_t cypher_bytes)
+      : clear_bytes(clear_bytes), cypher_bytes(cypher_bytes) {}
+  uint32_t clear_bytes;
+  uint32_t cypher_bytes;
+};
+
+}  // namespace media
+
+#endif  // SUBSAMPLE_ENTRY_H_