DNS: Add stubs for persisting data across restarts

net/dns/dns_session.cc

 // 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.
 
 #include "net/dns/dns_session.h"
 
 #include <stdint.h>
 
 #include <limits>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/sample_vector.h"
 #include "base/rand_util.h"
 #include "base/stl_util.h"
 #include "base/time/time.h"
+#include "base/values.h"
 #include "net/base/ip_endpoint.h"
 #include "net/base/net_errors.h"
 #include "net/dns/dns_config_service.h"
 #include "net/dns/dns_socket_pool.h"
 #include "net/dns/dns_util.h"
 #include "net/socket/stream_socket.h"
 #include "net/udp/datagram_client_socket.h"
 
 namespace net {
 
@@ skipping 250 matching lines @@
   SocketLease* lease = new SocketLease(this, server_index, std::move(socket));
   return std::unique_ptr<SocketLease>(lease);
 }
 
 std::unique_ptr<StreamSocket> DnsSession::CreateTCPSocket(
     unsigned server_index,
     const NetLog::Source& source) {
   return socket_pool_->CreateTCPSocket(server_index, source);
 }
 
+void DnsSession::ApplyPersistentData(const base::Value& data) {}
+
+std::unique_ptr<const base::Value> DnsSession::GetPersistentData() const {
+  return std::unique_ptr<const base::Value>();
+}
+
 // Release a socket.
 void DnsSession::FreeSocket(unsigned server_index,
                             std::unique_ptr<DatagramClientSocket> socket) {
   DCHECK(socket.get());
 
   socket->NetLog().EndEvent(NetLog::TYPE_SOCKET_IN_USE);
 
   socket_pool_->FreeSocket(server_index, std::move(socket));
 }
 
@@ skipping 36 matching lines @@
 
   timeout = std::max(timeout, base::TimeDelta::FromMilliseconds(kMinTimeoutMs));
 
   // The timeout still doubles every full round.
   unsigned num_backoffs = attempt / config_.nameservers.size();
 
   return std::min(timeout * (1 << num_backoffs), max_timeout_);
 }
 
 }  // namespace net