Add TransportSession interface to prepare for WebRTC-based transport.

remoting/protocol/channel_dispatcher_base.cc

Index: remoting/protocol/channel_dispatcher_base.cc
diff --git a/remoting/protocol/channel_dispatcher_base.cc b/remoting/protocol/channel_dispatcher_base.cc
index 3d54269bb24f624666e5897ca12295a2607470f5..65450617b44f9509eb3beb986ae7024e8830555c 100644
--- a/remoting/protocol/channel_dispatcher_base.cc
+++ b/remoting/protocol/channel_dispatcher_base.cc
@@ -9,6 +9,7 @@
 #include "remoting/protocol/session.h"
 #include "remoting/protocol/session_config.h"
 #include "remoting/protocol/stream_channel_factory.h"
+#include "remoting/protocol/transport.h"
 
 namespace remoting {
 namespace protocol {
@@ -30,7 +31,8 @@ void ChannelDispatcherBase::Init(Session* session,
   DCHECK(session);
   switch (config.transport) {
     case ChannelConfig::TRANSPORT_MUX_STREAM:
-      channel_factory_ = session->GetMultiplexedChannelFactory();
+      channel_factory_ =
+          session->GetTransportSession()->GetMultiplexedChannelFactory();
       break;
 
     case ChannelConfig::TRANSPORT_QUIC_STREAM:
@@ -38,7 +40,8 @@ void ChannelDispatcherBase::Init(Session* session,
       break;
 
     case ChannelConfig::TRANSPORT_STREAM:
-      channel_factory_ = session->GetTransportChannelFactory();
+      channel_factory_ =
+          session->GetTransportSession()->GetStreamChannelFactory();
       break;
 
     default: