Process incoming IQs in the same order that they were sent.

remoting/signaling/fake_signal_strategy.h

 // Copyright 2014 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_SIGNALING_FAKE_SIGNAL_STRATEGY_H_
 #define REMOTING_SIGNALING_FAKE_SIGNAL_STRATEGY_H_
 
 #include <list>
 #include <queue>
 #include <string>
@@ skipping 27 matching lines @@
 
   void set_send_delay(base::TimeDelta delay) {
     send_delay_ = delay;
   }
 
   // Connects current FakeSignalStrategy to receive messages from |peer|.
   void ConnectTo(FakeSignalStrategy* peer);
 
   void SetLocalJid(const std::string& jid);
 
+  // Simulates packet reordering by reorering the last session-info message and
+  // the first transport-info message in a multi-stepped auth.
+  void SimulatePackgeReordering();
+
   // SignalStrategy interface.
   void Connect() override;
   void Disconnect() override;
   State GetState() const override;
   Error GetError() const override;
   std::string GetLocalJid() const override;
   void AddListener(Listener* listener) override;
   void RemoveListener(Listener* listener) override;
   bool SendStanza(std::unique_ptr<buzz::XmlElement> stanza) override;
   std::string GetNextId() override;
 
  private:
   typedef base::Callback<void(std::unique_ptr<buzz::XmlElement> message)>
       PeerCallback;
 
   static void DeliverMessageOnThread(
       scoped_refptr<base::SingleThreadTaskRunner> thread,
       base::WeakPtr<FakeSignalStrategy> target,
       std::unique_ptr<buzz::XmlElement> stanza);
 
   // Called by the |peer_|. Takes ownership of |stanza|.
   void OnIncomingMessage(std::unique_ptr<buzz::XmlElement> stanza);
+  void NotifyListeners(std::unique_ptr<buzz::XmlElement> stanza);
   void SetPeerCallback(const PeerCallback& peer_callback);
 
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_;
 
   std::string jid_;
   PeerCallback peer_callback_;
   base::ObserverList<Listener, true> listeners_;
 
   int last_id_;
 
   base::TimeDelta send_delay_;
 
+  bool simulate_reorder_ = false;
+  std::unique_ptr<buzz::XmlElement> pending_session_info_;
+  int session_info_counts_ = 0;
+
   // All received messages, includes thouse still in |pending_messages_|.
   std::list<buzz::XmlElement*> received_messages_;
 
   base::WeakPtrFactory<FakeSignalStrategy> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeSignalStrategy);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_SIGNALING_FAKE_SIGNAL_STRATEGY_H_