Chromecast media pipeline: handle CENC "full sample encryption" case.

chromecast/media/cma/ipc_streamer/decrypt_config_marshaller.h

Index: chromecast/media/cma/ipc_streamer/decrypt_config_marshaller.h
diff --git a/chromecast/media/cma/ipc_streamer/decrypt_config_marshaller.h b/chromecast/media/cma/ipc_streamer/decrypt_config_marshaller.h
index b600ba41c147e92e743f3a1c3fd25ffee7811d33..eb168faf2018cbda076812a072f5f7117c429aec 100644
--- a/chromecast/media/cma/ipc_streamer/decrypt_config_marshaller.h
+++ b/chromecast/media/cma/ipc_streamer/decrypt_config_marshaller.h
@@ -21,6 +21,12 @@ class DecryptConfigMarshaller {
   static void Write(
       const ::media::DecryptConfig& config, MediaMessage* msg);
 
+  // Writes the serialized structure of |config| into |msg|, assuming one
+  // subsample with |data_size| encrypted bytes. This handles the
+  // "Full Sample Encryption" case in ISO/IEC 23001-7:2012 9.5.
+  static void WriteFullSampleEncryption(
+      const ::media::DecryptConfig& config, int data_size, MediaMessage* msg);
+
   // Returns a DecryptConfig from its serialized structure.
   static scoped_ptr< ::media::DecryptConfig> Read(MediaMessage* msg);
 };