media config: expand is_encrypted to a struct.

chromecast/common/media/cma_param_traits.h

Index: chromecast/common/media/cma_param_traits.h
diff --git a/chromecast/common/media/cma_param_traits.h b/chromecast/common/media/cma_param_traits.h
index 106012bed8b3ca9c91eaaa94f8a3dd0e82825334..e59228e81b8e68d9a19fc6b82a04fd7b90085b7c 100644
--- a/chromecast/common/media/cma_param_traits.h
+++ b/chromecast/common/media/cma_param_traits.h
@@ -10,6 +10,7 @@
 namespace media {
 class AudioDecoderConfig;
 class VideoDecoderConfig;
+class EncryptionScheme;
 }
 
 namespace IPC {
@@ -30,6 +31,14 @@ struct ParamTraits<media::VideoDecoderConfig> {
   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_