Add quic_test_loopback used for tests only.

net/tools/quic/quic_client_test.cc

 // Copyright (c) 2014 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.
 
 #include "net/tools/quic/quic_client.h"
 
 #include <dirent.h>
 #include <stdio.h>
 
 #include <memory>
 
 #include "base/files/file_enumerator.h"
 #include "base/files/file_util.h"
 #include "net/quic/platform/api/quic_test.h"
+#include "net/quic/platform/api/quic_test_loopback.h"
 #include "net/quic/platform/api/quic_text_utils.h"
 #include "net/quic/test_tools/crypto_test_utils.h"
 #include "net/quic/test_tools/quic_test_utils.h"
 #include "net/tools/epoll_server/epoll_server.h"
 #include "net/tools/quic/test_tools/quic_client_peer.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace net {
 namespace test {
 namespace {
@@ skipping 17 matching lines @@
       socket_count++;
     }
   }
 
   return socket_count;
 }
 
 // Creates a new QuicClient and Initializes it. Caller is responsible for
 // deletion.
 QuicClient* CreateAndInitializeQuicClient(EpollServer* eps, uint16_t port) {
-  QuicSocketAddress server_address(
-      QuicSocketAddress(QuicIpAddress::Loopback4(), port));
+  QuicSocketAddress server_address(QuicSocketAddress(TestLoopback(), port));
   QuicServerId server_id("hostname", server_address.port(),
                          PRIVACY_MODE_DISABLED);
   QuicVersionVector versions = AllSupportedVersions();
   QuicClient* client =
       new QuicClient(server_address, server_id, versions, eps,
                      crypto_test_utils::ProofVerifierForTesting());
   EXPECT_TRUE(client->Initialize());
   return client;
 }
 
@@ skipping 46 matching lines @@
   // Clean up UDP sockets.
   QuicClientPeer::CleanUpUDPSocket(client.get(), client->GetLatestFD());
   EXPECT_EQ(number_of_open_fds + 2, NumOpenSocketFDs());
   QuicClientPeer::CleanUpUDPSocket(client.get(), client->GetLatestFD());
   EXPECT_EQ(number_of_open_fds + 1, NumOpenSocketFDs());
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net