media config: expand is_encrypted to a struct.

chromecast/common/media/cma_param_traits.h

 // Copyright 2014 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_COMMON_MEDIA_CMA_PARAM_TRAITS_H_
 #define CHROMECAST_COMMON_MEDIA_CMA_PARAM_TRAITS_H_
 
 #include "ipc/ipc_message_utils.h"
 
 namespace media {
 class AudioDecoderConfig;
 class VideoDecoderConfig;
+class EncryptionScheme;
 }
 
 namespace IPC {
 
 template <>
 struct ParamTraits<media::AudioDecoderConfig> {
   typedef media::AudioDecoderConfig param_type;
   static void Write(Message* m, const param_type& p);
   static bool Read(const Message* m, base::PickleIterator* iter, param_type* r);
   static void Log(const param_type& p, std::string* l);
 };
 
 template <>
 struct ParamTraits<media::VideoDecoderConfig> {
   typedef media::VideoDecoderConfig param_type;
   static void Write(Message* m, const param_type& p);
   static bool Read(const Message* m, base::PickleIterator* iter, param_type* r);
   static void Log(const param_type& p, std::string* l);
 };
 
+template <>
+struct ParamTraits<media::EncryptionScheme> {
+  typedef media::EncryptionScheme param_type;

[halliwell, 2016/01/13 03:29:40]

nit: 'using' preferred to typedef in style guide now.

[dougsteed, 2016/02/09 22:58:53]

There are hundreds of existing instances of this pattern and as far as I know
they all use typedef, so I think I will leave it that way. (You did say "nit:"!)

+  static void Write(Message* m, const param_type& p);
+  static bool Read(const Message* m, base::PickleIterator* iter, param_type* r);
+  static void Log(const param_type& p, std::string* l);
+};
+
 }  // namespace IPC
 
 #endif  // CHROMECAST_COMMON_MEDIA_CMA_PARAM_TRAITS_H_