Implement utility-side host resolver Mojo client.

net/dns/type_converters.h

Index: net/dns/type_converters.h
diff --git a/net/dns/type_converters.h b/net/dns/type_converters.h
index 00dbbb99ea1734d4e5103d5d331b715e954422f8..5b3e46f88b8f5c74ddd0b68a87cbfc46de9df122 100644
--- a/net/dns/type_converters.h
+++ b/net/dns/type_converters.h
@@ -18,6 +18,13 @@ struct TypeConverter<net::HostResolver::RequestInfo,
 };
 
 template <>
+struct TypeConverter<net::interfaces::HostResolverRequestInfoPtr,
+                     net::HostResolver::RequestInfo> {
+  static net::interfaces::HostResolverRequestInfoPtr Convert(
+      const net::HostResolver::RequestInfo& obj);
+};
+
+template <>
 struct TypeConverter<net::interfaces::AddressListPtr, net::AddressList> {
   static net::interfaces::AddressListPtr Convert(const net::AddressList& obj);
 };