Revert of Refactoring that removes P2PTransport and DtlsTransport classes.

webrtc/pc/channelmanager_unittest.cc

Index: webrtc/pc/channelmanager_unittest.cc
diff --git a/webrtc/pc/channelmanager_unittest.cc b/webrtc/pc/channelmanager_unittest.cc
index 4e14453c633292adb8ba291f186ac49f93c65deb..174d064b0543b0da6fd8cd10ddf4a02910d79723 100644
--- a/webrtc/pc/channelmanager_unittest.cc
+++ b/webrtc/pc/channelmanager_unittest.cc
@@ -143,6 +143,31 @@
   cm_->Terminate();
 }
 
+// Test that we fail to create a voice/video channel if the session is unable
+// to create a cricket::TransportChannel
+TEST_F(ChannelManagerTest, NoTransportChannelTest) {
+  EXPECT_TRUE(cm_->Init());
+  transport_controller_->set_fail_channel_creation(true);
+  // The test is useless unless the session does not fail creating
+  // cricket::TransportChannel.
+  ASSERT_TRUE(transport_controller_->CreateTransportChannel_n(
+                  "audio", cricket::ICE_CANDIDATE_COMPONENT_RTP) == nullptr);
+
+  cricket::VoiceChannel* voice_channel = cm_->CreateVoiceChannel(
+      &fake_mc_, transport_controller_, cricket::CN_AUDIO, nullptr, false,
+      AudioOptions());
+  EXPECT_TRUE(voice_channel == nullptr);
+  cricket::VideoChannel* video_channel = cm_->CreateVideoChannel(
+      &fake_mc_, transport_controller_, cricket::CN_VIDEO, nullptr, false,
+      VideoOptions());
+  EXPECT_TRUE(video_channel == nullptr);
+  cricket::DataChannel* data_channel =
+      cm_->CreateDataChannel(transport_controller_, cricket::CN_DATA, nullptr,
+                             false, cricket::DCT_RTP);
+  EXPECT_TRUE(data_channel == nullptr);
+  cm_->Terminate();
+}
+
 TEST_F(ChannelManagerTest, SetVideoRtxEnabled) {
   std::vector<VideoCodec> codecs;
   const VideoCodec rtx_codec(96, "rtx");