Add TransportContext class.

remoting/protocol/ice_transport.h

Index: remoting/protocol/ice_transport.h
diff --git a/remoting/protocol/ice_transport.h b/remoting/protocol/ice_transport.h
index 09f7da6d5454942b5bd08cf64f2cd4808aad07d5..fc72b29d5664e3f46461a2bf2b1e336409747475 100644
--- a/remoting/protocol/ice_transport.h
+++ b/remoting/protocol/ice_transport.h
@@ -27,16 +27,10 @@ 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;
@@ -47,8 +41,6 @@ class IceTransport : public Transport,
  private:
   typedef std::map<std::string, IceTransportChannel*> ChannelsMap;
 
-  void OnCanStart();
-
   // DatagramChannelFactory interface.
   void CreateChannel(const std::string& name,
                      const ChannelCreatedCallback& callback) override;
@@ -76,11 +68,7 @@ class IceTransport : public Transport,
   // 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;
 
@@ -102,6 +90,20 @@ class IceTransport : public Transport,
   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