Add TransportContext class.

remoting/protocol/webrtc_transport.h

Index: remoting/protocol/webrtc_transport.h
diff --git a/remoting/protocol/webrtc_transport.h b/remoting/protocol/webrtc_transport.h
index afba35e5fbd61486e9a6dc397bd6a708e9a64efa..fac099ef8ea938bc67d1f190aecb988c3486376d 100644
--- a/remoting/protocol/webrtc_transport.h
+++ b/remoting/protocol/webrtc_transport.h
@@ -23,13 +23,13 @@ class FakeAudioDeviceModule;
 namespace remoting {
 namespace protocol {
 
+class TransportContext;
+
 class WebrtcTransport : public Transport,
                         public webrtc::PeerConnectionObserver {
  public:
   WebrtcTransport(rtc::Thread* worker_thread,
-                  rtc::scoped_refptr<webrtc::PortAllocatorFactoryInterface>
-                      port_allocator_factory,
-                  TransportRole role);
+                  scoped_refptr<TransportContext> transport_context);
   ~WebrtcTransport() override;
 
   webrtc::PeerConnectionInterface* peer_connection() {
@@ -48,6 +48,9 @@ class WebrtcTransport : public Transport,
   WebrtcTransport* AsWebrtcTransport() override;
 
  private:
+  void OnPortAllocatorCreated(
+      scoped_ptr<cricket::PortAllocator> port_allocator);
+
   void OnLocalSessionDescriptionCreated(
       scoped_ptr<webrtc::SessionDescriptionInterface> description,
       const std::string& error);
@@ -79,9 +82,7 @@ class WebrtcTransport : public Transport,
 
   base::ThreadChecker thread_checker_;
 
-  rtc::scoped_refptr<webrtc::PortAllocatorFactoryInterface>
-      port_allocator_factory_;
-  TransportRole role_;
+  scoped_refptr<TransportContext> transport_context_;
   EventHandler* event_handler_ = nullptr;
   rtc::Thread* worker_thread_;
 
@@ -110,12 +111,8 @@ class WebrtcTransport : public Transport,
 
 class WebrtcTransportFactory : public TransportFactory {
  public:
-  WebrtcTransportFactory(
-      rtc::Thread* worker_thread,
-      SignalStrategy* signal_strategy,
-      rtc::scoped_refptr<webrtc::PortAllocatorFactoryInterface>
-          port_allocator_factory,
-      TransportRole role);
+  WebrtcTransportFactory(rtc::Thread* worker_thread,
+                         scoped_refptr<TransportContext> transport_context);
   ~WebrtcTransportFactory() override;
 
   // TransportFactory interface.
@@ -123,10 +120,7 @@ class WebrtcTransportFactory : public TransportFactory {
 
  private:
   rtc::Thread* worker_thread_;
-  SignalStrategy* signal_strategy_;
-  rtc::scoped_refptr<webrtc::PortAllocatorFactoryInterface>
-      port_allocator_factory_;
-  TransportRole role_;
+  scoped_refptr<TransportContext> transport_context_;
 
   DISALLOW_COPY_AND_ASSIGN(WebrtcTransportFactory);
 };