Add audio support in WebrtcConnectionToHost, audio unittest

remoting/protocol/session_config.cc

Index: remoting/protocol/session_config.cc
diff --git a/remoting/protocol/session_config.cc b/remoting/protocol/session_config.cc
index 7a6a9caaf249fab8ca3916c0738f4b32fc765379..f1794dbc20a11403d1fdf45696a73c01447bf7c5 100644
--- a/remoting/protocol/session_config.cc
+++ b/remoting/protocol/session_config.cc
@@ -149,18 +149,18 @@ std::unique_ptr<SessionConfig> SessionConfig::GetFinalConfig(
 // static
 std::unique_ptr<SessionConfig> SessionConfig::ForTest() {
   std::unique_ptr<SessionConfig> result(new SessionConfig(Protocol::ICE));
-  result->control_config_ = ChannelConfig(ChannelConfig::TRANSPORT_MUX_STREAM,
-                                          kControlStreamVersion,
-                                          ChannelConfig::CODEC_UNDEFINED);
-  result->event_config_ = ChannelConfig(ChannelConfig::TRANSPORT_MUX_STREAM,
-                                        kDefaultStreamVersion,
-                                        ChannelConfig::CODEC_UNDEFINED);
-  result->video_config_ = ChannelConfig(ChannelConfig::TRANSPORT_STREAM,
-                                        kDefaultStreamVersion,
-                                        ChannelConfig::CODEC_VP8);
-  result->audio_config_ = ChannelConfig(ChannelConfig::TRANSPORT_NONE,
-                                        kDefaultStreamVersion,
-                                        ChannelConfig::CODEC_UNDEFINED);
+  result->control_config_ =
+      ChannelConfig(ChannelConfig::TRANSPORT_MUX_STREAM, kControlStreamVersion,
+                    ChannelConfig::CODEC_UNDEFINED);
+  result->event_config_ =
+      ChannelConfig(ChannelConfig::TRANSPORT_MUX_STREAM, kDefaultStreamVersion,
+                    ChannelConfig::CODEC_UNDEFINED);
+  result->video_config_ =
+      ChannelConfig(ChannelConfig::TRANSPORT_STREAM, kDefaultStreamVersion,
+                    ChannelConfig::CODEC_VP8);
+  result->audio_config_ =
+      ChannelConfig(ChannelConfig::TRANSPORT_MUX_STREAM, kDefaultStreamVersion,
+                    ChannelConfig::CODEC_OPUS);
   return result;
 }