[net/dns] Handle TC bit on DNS response in DnsTransaction.

net/dns/dns_socket_pool.h

 // Copyright (c) 2012 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_DNS_SOCKET_POOL_H_
 #define NET_DNS_DNS_SOCKET_POOL_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "net/base/net_export.h"
+#include "net/base/net_log.h"
 
 namespace net {
 
 class ClientSocketFactory;
 class DatagramClientSocket;
 class IPEndPoint;
 class NetLog;
+class StreamSocket;
 
 // A DnsSocketPool is an abstraction layer around a ClientSocketFactory that
 // allows preallocation, reuse, or other strategies to manage sockets connected
 // to DNS servers.
 class NET_EXPORT_PRIVATE DnsSocketPool {
  public:
   virtual ~DnsSocketPool() { }
 
   // Creates a DnsSocketPool that implements the default strategy for managing
   // sockets.  (This varies by platform; see DnsSocketPoolImpl in
@@ skipping 23 matching lines @@
   // one on which Connect fails).
   virtual scoped_ptr<DatagramClientSocket> AllocateSocket(
       unsigned server_index) = 0;
 
   // Frees a socket allocated by AllocateSocket.  |server_index| must be the
   // same index passed to AllocateSocket.
   virtual void FreeSocket(
       unsigned server_index,
       scoped_ptr<DatagramClientSocket> socket) = 0;
 
+  // Creates a StreamSocket from the factory for a transaction over TCP. These
+  // sockets are not pooled.
+  scoped_ptr<StreamSocket> CreateTCPSocket(
+      unsigned server_index,
+      const NetLog::Source& source);
+
  protected:
   DnsSocketPool(ClientSocketFactory* socket_factory);
 
   void InitializeInternal(
       const std::vector<IPEndPoint>* nameservers,
       NetLog* net_log);
 
   scoped_ptr<DatagramClientSocket> CreateConnectedSocket(
       unsigned server_index);
 
  private:
   ClientSocketFactory* socket_factory_;
   NetLog* net_log_;
   const std::vector<IPEndPoint>* nameservers_;
   bool initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(DnsSocketPool);
 };
 
 } // namespace net
 
 #endif // NET_DNS_DNS_SOCKET_POOL_H_