DNS: Add stubs for persisting data across restarts

net/dns/dns_client.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_client.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
@@ skipping 38 matching lines @@
   const DnsConfig* GetConfig() const override {
     return session_.get() ? &session_->config() : NULL;
   }
 
   DnsTransactionFactory* GetTransactionFactory() override {
     return session_.get() ? factory_.get() : NULL;
   }
 
   AddressSorter* GetAddressSorter() override { return address_sorter_.get(); }
 
+  std::unique_ptr<const base::Value> GetPersistentData() const override {
+    if (!session_)
+      return std::unique_ptr<const base::Value>();
+    return session_->GetPersistentData();
+  }
+
+  void ApplyPersistentData(const base::Value& data) override {
+    if (!session_)
+      return;
+    session_->ApplyPersistentData(data);
+  }
+
  private:
   scoped_refptr<DnsSession> session_;
   std::unique_ptr<DnsTransactionFactory> factory_;
   std::unique_ptr<AddressSorter> address_sorter_;
 
   NetLog* net_log_;
 
   ClientSocketFactory* socket_factory_;
   const RandIntCallback rand_int_callback_;
 
@@ skipping 13 matching lines @@
 std::unique_ptr<DnsClient> DnsClient::CreateClientForTesting(
     NetLog* net_log,
     ClientSocketFactory* socket_factory,
     const RandIntCallback& rand_int_callback) {
   return base::WrapUnique(
       new DnsClientImpl(net_log, socket_factory, rand_int_callback));
 }
 
 }  // namespace net