Adding OrtcFactory, and changing UdpTransport to match current plan.

webrtc/api/BUILD.gn

Index: webrtc/api/BUILD.gn
diff --git a/webrtc/api/BUILD.gn b/webrtc/api/BUILD.gn
index 7c5e302d65bffbaae88c7f89e9744ccb9eded22a..2084c08201204c9fba63bdf36e7ea9a49eef8dc0 100644
--- a/webrtc/api/BUILD.gn
+++ b/webrtc/api/BUILD.gn
@@ -75,6 +75,8 @@ rtc_static_library("libjingle_peerconnection") {
     "mediastreamtrack.h",
     "mediastreamtrackproxy.h",
     "notifier.h",
+    "ortcfactory.cc",
+    "ortcfactory.h",
     "peerconnection.cc",
     "peerconnection.h",
     "peerconnectionfactory.cc",
@@ -101,6 +103,7 @@ rtc_static_library("libjingle_peerconnection") {
     "statstypes.cc",
     "statstypes.h",
     "streamcollection.h",
+    "udptransportinterface.h",
     "videocapturertracksource.cc",
     "videocapturertracksource.h",
     "videosourceproxy.h",
@@ -234,6 +237,7 @@ if (rtc_include_tests) {
       "localaudiosource_unittest.cc",
       "mediaconstraintsinterface_unittest.cc",
       "mediastream_unittest.cc",
+      "ortcfactory_unittest.cc",
       "peerconnection_unittest.cc",
       "peerconnectionendtoend_unittest.cc",
       "peerconnectionfactory_unittest.cc",