Add TransportContext class.

remoting/protocol/ice_transport.h

 // Copyright 2015 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_ICE_TRANSPORT_H_
 #define REMOTING_PROTOCOL_ICE_TRANSPORT_H_
 
 #include <list>
 #include <map>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/timer/timer.h"
 #include "remoting/protocol/datagram_channel_factory.h"
 #include "remoting/protocol/ice_transport_channel.h"
 #include "remoting/protocol/jingle_messages.h"
 #include "remoting/protocol/transport.h"
 
 namespace remoting {
 namespace protocol {
 
 class ChannelMultiplexer;
 class PseudoTcpChannelFactory;
 class SecureChannelFactory;
 
 class IceTransport : public Transport,
                      public IceTransportChannel::Delegate,
                      public DatagramChannelFactory {
  public:
-  // |port_allocator| must outlive the session.
-  IceTransport(cricket::PortAllocator* port_allocator,
-               const NetworkSettings& network_settings,
-               TransportRole role);
+  // |transport_context| must outlive the session.
+  explicit IceTransport(scoped_refptr<TransportContext> transport_context);
   ~IceTransport() override;
 
-  // Returns a closure that must be called before transport channels start
-  // connecting .
-  base::Closure GetCanStartClosure();
-
   // Transport interface.
   void Start(EventHandler* event_handler,
              Authenticator* authenticator) override;
   bool ProcessTransportInfo(buzz::XmlElement* transport_info) override;
   StreamChannelFactory* GetStreamChannelFactory() override;
   StreamChannelFactory* GetMultiplexedChannelFactory() override;
 
  private:
   typedef std::map<std::string, IceTransportChannel*> ChannelsMap;
 
-  void OnCanStart();
-
   // DatagramChannelFactory interface.
   void CreateChannel(const std::string& name,
                      const ChannelCreatedCallback& callback) override;
   void CancelChannelCreation(const std::string& name) override;
 
   // Passes transport info to a new |channel| in case it was received before the
   // channel was created.
   void AddPendingRemoteTransportInfo(IceTransportChannel* channel);
 
   // IceTransportChannel::Delegate interface.
   void OnTransportIceCredentials(IceTransportChannel* transport,
                                  const std::string& ufrag,
                                  const std::string& password) override;
   void OnTransportCandidate(IceTransportChannel* transport,
                             const cricket::Candidate& candidate) override;
   void OnTransportRouteChange(IceTransportChannel* transport,
                               const TransportRoute& route) override;
   void OnTransportFailed(IceTransportChannel* transport) override;
   void OnTransportDeleted(IceTransportChannel* transport) override;
 
   // Creates empty |pending_transport_info_message_| and schedules timer for
   // SentTransportInfo() to sent the message later.
   void EnsurePendingTransportInfoMessage();
 
   // Sends transport-info message with candidates from |pending_candidates_|.
   void SendTransportInfo();
 
-  cricket::PortAllocator* port_allocator_;
-  NetworkSettings network_settings_;
-  TransportRole role_;
-
-  bool can_start_ = false;
+  scoped_refptr<TransportContext> transport_context_;
 
   Transport::EventHandler* event_handler_ = nullptr;
 
   ChannelsMap channels_;
   scoped_ptr<PseudoTcpChannelFactory> pseudotcp_channel_factory_;
   scoped_ptr<SecureChannelFactory> secure_channel_factory_;
   scoped_ptr<ChannelMultiplexer> channel_multiplexer_;
 
   // Pending remote transport info received before the local channels were
   // created.
   std::list<IceTransportInfo::IceCredentials> pending_remote_ice_credentials_;
   std::list<IceTransportInfo::NamedCandidate> pending_remote_candidates_;
 
   scoped_ptr<IceTransportInfo> pending_transport_info_message_;
   base::OneShotTimer transport_info_timer_;
 
   base::WeakPtrFactory<IceTransport> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IceTransport);
 };
 
+class IceTransportFactory : public TransportFactory {
+ public:
+  IceTransportFactory(scoped_refptr<TransportContext> transport_context);
+  ~IceTransportFactory() override;
+
+  // TransportFactory interface.
+  scoped_ptr<Transport> CreateTransport() override;
+
+ private:
+  scoped_refptr<TransportContext> transport_context_;
+
+  DISALLOW_COPY_AND_ASSIGN(IceTransportFactory);
+};
+
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_ICE_TRANSPORT_H_