[Chromoting] Add a simple Windows app that registers and starts a host.

remoting/host/setup/host_starter.h

Index: remoting/host/setup/host_starter.h
diff --git a/remoting/host/setup/host_starter.h b/remoting/host/setup/host_starter.h
index 91db5c074a6465c60f85dbe1a0bcf460fcafbd85..508e13aff13340e4884ec0775c454c513a5ea718 100644
--- a/remoting/host/setup/host_starter.h
+++ b/remoting/host/setup/host_starter.h
@@ -79,12 +79,16 @@ class HostStarter :
   std::string host_pin_;
   bool consent_to_data_collection_;
   CompletionCallback on_done_;
+  scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
   std::string refresh_token_;
   std::string access_token_;
   std::string user_email_;
   remoting::HostKeyPair key_pair_;
   std::string host_id_;
 
+  base::WeakPtrFactory<HostStarter> weak_ptr_factory_;
+  base::WeakPtr<HostStarter> weak_ptr_;
+
   DISALLOW_COPY_AND_ASSIGN(HostStarter);
 };