DNS: Add stubs for persisting data across restarts

net/dns/dns_test_util.h

 // 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.
 
 #ifndef NET_DNS_DNS_TEST_UTIL_H_
 #define NET_DNS_DNS_TEST_UTIL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 177 matching lines @@
 class MockDnsClient : public DnsClient {
  public:
   MockDnsClient(const DnsConfig& config, const MockDnsClientRuleList& rules);
   ~MockDnsClient() override;
 
   // DnsClient interface:
   void SetConfig(const DnsConfig& config) override;
   const DnsConfig* GetConfig() const override;
   DnsTransactionFactory* GetTransactionFactory() override;
   AddressSorter* GetAddressSorter() override;
+  void ApplyPersistentData(const base::Value& data) override;
+  std::unique_ptr<const base::Value> GetPersistentData() const override;
 
   // Completes all DnsTransactions that were delayed by a rule.
   void CompleteDelayedTransactions();
 
  private:
   DnsConfig config_;
   std::unique_ptr<MockTransactionFactory> factory_;
   std::unique_ptr<AddressSorter> address_sorter_;
 };
 
 }  // namespace net
 
 #endif  // NET_DNS_DNS_TEST_UTIL_H_