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

net/dns/dns_session.h

Index: net/dns/dns_session.h
diff --git a/net/dns/dns_session.h b/net/dns/dns_session.h
index 5cc1b1b8de190223e04fec43d494c49d706c829d..07880f247efb0e1402a26a77cb13253b684b8f64 100644
--- a/net/dns/dns_session.h
+++ b/net/dns/dns_session.h
@@ -14,12 +14,13 @@
 #include "net/base/rand_callback.h"
 #include "net/dns/dns_config_service.h"
 #include "net/dns/dns_socket_pool.h"
-#include "net/udp/datagram_client_socket.h"
 
 namespace net {
 
 class ClientSocketFactory;
+class DatagramClientSocket;
 class NetLog;
+class StreamSocket;
 
 // Session parameters and state shared between DNS transactions.
 // Ref-counted so that DnsClient::Request can keep working in absence of
@@ -36,6 +37,8 @@ class NET_EXPORT_PRIVATE DnsSession
                 scoped_ptr<DatagramClientSocket> socket);
     ~SocketLease();
 
+    unsigned server_index() const { return server_index_; }
+
     DatagramClientSocket* socket() { return socket_.get(); }
 
    private:
@@ -68,6 +71,9 @@ class NET_EXPORT_PRIVATE DnsSession
   scoped_ptr<SocketLease> AllocateSocket(unsigned server_index,
                                          const NetLog::Source& source);
 
+  scoped_ptr<StreamSocket> AllocateTCPSocket(unsigned server_index,
+                                             const NetLog::Source& source);
+
  private:
   friend class base::RefCounted<DnsSession>;
   ~DnsSession();