Blimp: add some hard-coded actions on client startup.

blimp/net/blimp_message_demultiplexer.cc

Index: blimp/net/blimp_message_demultiplexer.cc
diff --git a/blimp/net/blimp_message_demultiplexer.cc b/blimp/net/blimp_message_demultiplexer.cc
index 8c69702f8b642ebc7392aac2502051502084c22e..eb9edff789959767ed6ad8f2ce5b47aa0cae7963 100644
--- a/blimp/net/blimp_message_demultiplexer.cc
+++ b/blimp/net/blimp_message_demultiplexer.cc
@@ -39,6 +39,7 @@ void BlimpMessageDemultiplexer::ProcessMessage(
     return;
   }
 
+  DVLOG(2) << "Routed message " << *message << ".";
   receiver_iter->second->ProcessMessage(std::move(message), callback);
 }