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diff --git a/chromium/media/cdm/json_web_key.h b/chromium/media/cdm/json_web_key.h
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+++ b/chromium/media/cdm/json_web_key.h
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+// Copyright 2013 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.
+
+#ifndef MEDIA_CDM_JSON_WEB_KEY_H_
+#define MEDIA_CDM_JSON_WEB_KEY_H_
+
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "media/base/media_export.h"
+
+namespace media {
+
+// A JSON Web Key Set looks like the following in JSON:
+//   { "keys": [ JWK1, JWK2, ... ] }
+// A symmetric keys JWK looks like the following in JSON:
+//   { "kty":"oct",
+//     "kid":"AQIDBAUGBwgJCgsMDQ4PEA",
+//     "k":"FBUWFxgZGhscHR4fICEiIw" }
+// There may be other properties specified, but they are ignored.
+// Ref: http://tools.ietf.org/html/draft-ietf-jose-json-web-key and:
+// http://tools.ietf.org/html/draft-jones-jose-json-private-and-symmetric-key
+//
+// For EME WD, both 'kid' and 'k' are base64 encoded strings, without trailing
+// padding.
+
+// Vector of [key_id, key_value] pairs. Values are raw binary data, stored in
+// strings for convenience.
+typedef std::pair<std::string, std::string> KeyIdAndKeyPair;
+typedef std::vector<KeyIdAndKeyPair> KeyIdAndKeyPairs;
+
+// Converts a single |key|, |key_id| pair to a JSON Web Key Set.
+MEDIA_EXPORT std::string GenerateJWKSet(const uint8* key, int key_length,
+                                        const uint8* key_id, int key_id_length);
+
+// Extracts the JSON Web Keys from a JSON Web Key Set. If |input| looks like
+// a valid JWK Set, then true is returned and |keys| is updated to contain
+// the list of keys found. Otherwise return false.
+MEDIA_EXPORT bool ExtractKeysFromJWKSet(const std::string& jwk_set,
+                                        KeyIdAndKeyPairs* keys);
+
+}  // namespace media
+
+#endif  // MEDIA_CDM_JSON_WEB_KEY_H_