[Chromoting] Add SessionPlugin in JingleSession

remoting/protocol/jingle_messages.h

 // Copyright (c) 2012 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 REMOTING_PROTOCOL_JINGLE_MESSAGES_H_
 #define REMOTING_PROTOCOL_JINGLE_MESSAGES_H_
 
 #include <list>
 #include <memory>
 #include <string>
@@ skipping 72 matching lines @@
   ~JingleMessage();
 
   // Caller keeps ownership of |stanza|.
   static bool IsJingleMessage(const buzz::XmlElement* stanza);
   static std::string GetActionName(ActionType action);
 
   // Caller keeps ownership of |stanza|. |error| is set to debug error
   // message when parsing fails.
   bool ParseXml(const buzz::XmlElement* stanza, std::string* error);
 
+  // Adds an XmlElement into |attachments|. This function implicitly creates
+  // |attachments| if it's empty, and |attachment| should not be an empty
+  // unique_ptr.
+  void AddAttachment(std::unique_ptr<buzz::XmlElement> attachment);
+
   std::unique_ptr<buzz::XmlElement> ToXml() const;
 
   SignalingAddress from;
   SignalingAddress to;
   ActionType action = UNKNOWN_ACTION;
   std::string sid;
 
   std::string initiator;
 
   std::unique_ptr<ContentDescription> description;
@@ skipping 77 matching lines @@
   std::unique_ptr<buzz::XmlElement> ToXml() const;
 
   std::list<IceCredentials> ice_credentials;
   std::list<NamedCandidate> candidates;
 };
 
 }  // protocol
 }  // remoting
 
 #endif  // REMOTING_PROTOCOL_JINGLE_MESSAGES_H_