Add an explicit way of forcing the MDnsClient to listen on the network

net/dns/mdns_client_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_DNS_MDNS_CLIENT_IMPL_H_
 #define NET_DNS_MDNS_CLIENT_IMPL_H_
 
 #include <map>
 #include <string>
 #include <utility>
@@ skipping 163 matching lines @@
       uint16 rrtype,
       const std::string& name,
       MDnsListener::Delegate* delegate) OVERRIDE;
 
   virtual scoped_ptr<MDnsTransaction> CreateTransaction(
       uint16 rrtype,
       const std::string& name,
       int flags,
       const MDnsTransaction::ResultCallback& callback) OVERRIDE;
 
-  // Returns true when the client is listening for network packets.
-  bool IsListeningForTests();
-
-  bool AddListenRef();
-  void SubtractListenRef();
+  virtual bool StartListening() OVERRIDE;
+  virtual void StopListening() OVERRIDE;
+  virtual bool IsListening() const OVERRIDE;
 
   Core* core() { return core_.get(); }
 
  private:
-  // This method causes the client to stop listening for packets. The
-  // call for it is deferred through the message loop after the last
-  // listener is removed. If another listener is added after a
-  // shutdown is scheduled but before it actually runs, the shutdown
-  // will be canceled.
-  void Shutdown();
-
   scoped_ptr<Core> core_;
-  int listen_refs_;
 
   scoped_ptr<MDnsConnection::SocketFactory> socket_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MDnsClientImpl);
 };
 
 class MDnsListenerImpl : public MDnsListener,
                          public base::SupportsWeakPtr<MDnsListenerImpl> {
  public:
   MDnsListenerImpl(uint16 rrtype,
@@ skipping 87 matching lines @@
   MDnsClientImpl* client_;
 
   bool started_;
   int flags_;
 
   DISALLOW_COPY_AND_ASSIGN(MDnsTransactionImpl);
 };
 
 }  // namespace net
 #endif  // NET_DNS_MDNS_CLIENT_IMPL_H_