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

net/dns/dns_session.cc

Index: net/dns/dns_session.cc
diff --git a/net/dns/dns_session.cc b/net/dns/dns_session.cc
index bd4abb44ef1efffa19c6510526e69848da24561f..4c3e7641d9e4bd82271607bbb3983ede8e2b83d4 100644
--- a/net/dns/dns_session.cc
+++ b/net/dns/dns_session.cc
@@ -13,6 +13,8 @@
 #include "net/base/net_errors.h"
 #include "net/dns/dns_config_service.h"
 #include "net/dns/dns_socket_pool.h"
+#include "net/socket/stream_socket.h"
+#include "net/udp/datagram_client_socket.h"
 
 namespace net {
 
@@ -75,6 +77,12 @@ scoped_ptr<DnsSession::SocketLease> DnsSession::AllocateSocket(
   return scoped_ptr<SocketLease>(lease);
 }
 
+scoped_ptr<StreamSocket> DnsSession::AllocateTCPSocket(
+    unsigned server_index,
+    const NetLog::Source& source) {
+  return socket_pool_->AllocateTCPSocket(server_index, source);
+}
+
 // Release a socket.
 void DnsSession::FreeSocket(
     unsigned server_index,