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diff --git a/media/cdm/json_web_key.h b/media/cdm/json_web_key.h
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+++ b/media/cdm/json_web_key.h
@@ -0,0 +1,21 @@
+// 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 "base/basictypes.h"
+#include "media/base/media_export.h"
+
+namespace media {
+
+// Convert |key|, |key_id| 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);
+
+}  // namespace media
+
+#endif  // MEDIA_CDM_JSON_WEB_KEY_H_