Add TransportContext class.

remoting/remoting_srcs.gypi

Index: remoting/remoting_srcs.gypi
diff --git a/remoting/remoting_srcs.gypi b/remoting/remoting_srcs.gypi
index cbd416fbcd56c7bb643618d04d0592c3e644fc1d..7baf7e41c92408380e0fd89daa4d45e53b03f21d 100644
--- a/remoting/remoting_srcs.gypi
+++ b/remoting/remoting_srcs.gypi
@@ -118,8 +118,6 @@
       'protocol/host_video_dispatcher.h',
       'protocol/ice_transport_channel.cc',
       'protocol/ice_transport_channel.h',
-      'protocol/ice_transport_factory.cc',
-      'protocol/ice_transport_factory.h',
       'protocol/ice_transport.cc',
       'protocol/ice_transport.h',
       'protocol/input_event_tracker.cc',
@@ -193,6 +191,8 @@
       'protocol/token_validator.h',
       'protocol/transport.cc',
       'protocol/transport.h',
+      'protocol/transport_context.cc',
+      'protocol/transport_context.h',
       'protocol/v2_authenticator.cc',
       'protocol/v2_authenticator.h',
       'protocol/video_stub.h',
@@ -204,8 +204,6 @@
       'protocol/capture_scheduler.h',
       'protocol/chromium_port_allocator.cc',
       'protocol/chromium_port_allocator.h',
-      'protocol/chromium_port_allocator_factory.cc',
-      'protocol/chromium_port_allocator_factory.h',
       'protocol/chromium_socket_factory.cc',
       'protocol/chromium_socket_factory.h',
       'protocol/ice_connection_to_client.cc',