Parse termination reason and propagate the error to the Session interface.

remoting/protocol/jingle_messages.h

Index: remoting/protocol/jingle_messages.h
diff --git a/remoting/protocol/jingle_messages.h b/remoting/protocol/jingle_messages.h
index f997de8ad6e542bc84de2878943f0c3e952979d9..eb1ec5c58a7da94ecd05a6c25cf6d87fc6442032 100644
--- a/remoting/protocol/jingle_messages.h
+++ b/remoting/protocol/jingle_messages.h
@@ -33,6 +33,15 @@ struct JingleMessage {
     TRANSPORT_INFO,
   };
 
+  enum Reason {
+    // Currently only termination reasons that can be sent by the host
+    // are understood. All others are converted to UNKNOWN_REASON.
+    UNKNOWN_REASON,
+    SUCCESS,
+    DECLINE,
+    INCOMPATIBLE_PARAMETERS,
+  };
+
   JingleMessage();
   JingleMessage(const std::string& to_value,
                 ActionType action_value,
@@ -56,7 +65,10 @@ struct JingleMessage {
   scoped_ptr<ContentDescription> description;
   std::list<cricket::Candidate> candidates;
 
-  buzz::QName termination_reason;
+  // Value from the <reason> tag if it is present in the
+  // message. Useful mainly for session-terminate messages, but Jingle
+  // spec allows it in any message.
+  Reason reason;
 };
 
 struct JingleMessageReply {