DNS: Add stubs for persisting data across restarts

net/dns/dns_client.cc

Index: net/dns/dns_client.cc
diff --git a/net/dns/dns_client.cc b/net/dns/dns_client.cc
index 274cefa19d0af2c892ad5f6715cf838e15b1ceec..d4390ba490e2bc659c579c470f12d3f60978d1dc 100644
--- a/net/dns/dns_client.cc
+++ b/net/dns/dns_client.cc
@@ -21,6 +21,7 @@ namespace net {
 
 namespace {
 
+#if !defined(OS_IOS)

[Charlie Harrison, 2016/07/26 13:49:42]

Why is this necessary?

[Julia Tuttle, 2016/07/26 21:10:13]

It's not! Fixed.

 class DnsClientImpl : public DnsClient {
  public:
   DnsClientImpl(NetLog* net_log,
@@ -56,6 +57,18 @@ class DnsClientImpl : public DnsClient {
 
   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_;
@@ -68,14 +81,26 @@ class DnsClientImpl : public DnsClient {
 
   DISALLOW_COPY_AND_ASSIGN(DnsClientImpl);
 };
+#endif  // !defined(OS_IOS)
 
 }  // namespace
 
+void DnsClient::ApplyPersistentData(const base::Value& data) {}
+
+std::unique_ptr<const base::Value> DnsClient::GetPersistentData() const {
+  return std::unique_ptr<const base::Value>();
+}
+
 // static
 std::unique_ptr<DnsClient> DnsClient::CreateClient(NetLog* net_log) {
+#if !defined(OS_IOS)
   return base::WrapUnique(
       new DnsClientImpl(net_log, ClientSocketFactory::GetDefaultFactory(),
                         base::Bind(&base::RandInt)));
+#else   // defined(OS_IOS)
+  NOTIMPLEMENTED();
+  return std::unique_ptr<DnsClient>(nullptr);
+#endif  // defined(OS_IOS)
 }
 
 // static
@@ -83,8 +108,13 @@ std::unique_ptr<DnsClient> DnsClient::CreateClientForTesting(
     NetLog* net_log,
     ClientSocketFactory* socket_factory,
     const RandIntCallback& rand_int_callback) {
+#if !defined(OS_IOS)
   return base::WrapUnique(
       new DnsClientImpl(net_log, socket_factory, rand_int_callback));
+#else   // defined(OS_IOS)
+  NOTIMPLEMENTED();
+  return std::unique_ptr<DnsClient>(nullptr);
+#endif  // defined(OS_IOS)
 }
 
 }  // namespace net