media config: expand is_encrypted to a struct.

chromecast/media/cma/ipc_streamer/encryption_scheme_marshaller.h

+// Copyright 2015 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 CHROMECAST_MEDIA_CMA_IPC_STREAMER_ENCRYPTION_SCHEME_MARSHALLER_H_
+#define CHROMECAST_MEDIA_CMA_IPC_STREAMER_ENCRYPTION_SCHEME_MARSHALLER_H_
+
+#include "media/base/encryption_scheme.h"
+
+namespace chromecast {
+namespace media {
+class MediaMessage;
+
+class EncryptionSchemeMarshaller {
+ public:
+  // Writes the serialized structure of |encryption_scheme| into |msg|.
+  static void Write(
+      const ::media::EncryptionScheme& encryption_scheme, MediaMessage* msg);
+
+  // Returns an EncryptionScheme from its serialized structure.
+  static ::media::EncryptionScheme Read(MediaMessage* msg);
+};
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_MEDIA_CMA_IPC_STREAMER_ENCRYPTION_SCHEME_MARSHALLER_H_