Implement a dummy host to do capturing and analysis only.

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 4a2c82710b5d66769e2b9cc288c1112d888e8d04..7a6a9caaf249fab8ca3916c0738f4b32fc765379 100644
--- a/remoting/protocol/session_config.cc
+++ b/remoting/protocol/session_config.cc
@@ -164,6 +164,14 @@ std::unique_ptr<SessionConfig> SessionConfig::ForTest() {
   return result;
 }
 
+std::unique_ptr<SessionConfig> SessionConfig::ForTestWithAudio() {
+  std::unique_ptr<SessionConfig> result(ForTest());
+  result->audio_config_ = ChannelConfig(ChannelConfig::TRANSPORT_STREAM,
+                                        kDefaultStreamVersion,
+                                        ChannelConfig::CODEC_OPUS);
+  return result;
+}
+
 std::unique_ptr<SessionConfig> SessionConfig::ForTestWithVerbatimVideo() {
   std::unique_ptr<SessionConfig> result = ForTest();
   result->video_config_ = ChannelConfig(ChannelConfig::TRANSPORT_STREAM,