Added piping for sending audio packets from host to client.

remoting/protocol/session_config.h

Index: remoting/protocol/session_config.h
diff --git a/remoting/protocol/session_config.h b/remoting/protocol/session_config.h
index e1cd39e26defae639cf7ede134fa69a0b2db9c01..f741a45c7cb14b5e572c78e32f8e0ae67d6fca43 100644
--- a/remoting/protocol/session_config.h
+++ b/remoting/protocol/session_config.h
@@ -23,6 +23,7 @@ struct ChannelConfig {
   enum TransportType {
     TRANSPORT_STREAM,
     TRANSPORT_DATAGRAM,
+    TRANSPORT_NONE,
   };
 
   enum Codec {
@@ -62,6 +63,10 @@ class SessionConfig {
     video_config_ = video_config;
   }
   const ChannelConfig& video_config() const { return video_config_; }
+  void set_audio_config(const ChannelConfig& audio_config) {
+    audio_config_ = audio_config;
+  }
+  const ChannelConfig& audio_config() const { return audio_config_; }
 
   static SessionConfig GetDefault();
 
@@ -69,6 +74,7 @@ class SessionConfig {
   ChannelConfig control_config_;
   ChannelConfig event_config_;
   ChannelConfig video_config_;
+  ChannelConfig audio_config_;
 };
 
 // Defines session description that is sent from client to the host in the
@@ -102,6 +108,14 @@ class CandidateSessionConfig {
     return &video_configs_;
   }
 
+  const std::vector<ChannelConfig>& audio_configs() const {
+    return audio_configs_;
+  }
+
+  std::vector<ChannelConfig>* mutable_audio_configs() {
+    return &audio_configs_;
+  }
+
   // Selects session configuration that is supported by both participants.
   // NULL is returned if such configuration doesn't exist. When selecting
   // channel configuration priority is given to the configs listed first
@@ -140,6 +154,7 @@ class CandidateSessionConfig {
   std::vector<ChannelConfig> control_configs_;
   std::vector<ChannelConfig> event_configs_;
   std::vector<ChannelConfig> video_configs_;
+  std::vector<ChannelConfig> audio_configs_;
 };
 
 }  // namespace protocol