Make ERR_ICANN_NAME_COLLISION work for async DNS resolver.

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 140 matching lines @@
 static const char kT3CanonName[] = "www.l.google.com";
 static const int kT3TTL = 0x00000015;
 // +2 for the CNAME records, +1 for TXT record.
 static const unsigned kT3RecordCount = arraysize(kT3IpAddresses) + 3;
 
 class AddressSorter;
 class DnsClient;
 class MockTransactionFactory;
 
 struct MockDnsClientRule {
-  enum Result {
+  enum ResultType {
     FAIL,     // Fail asynchronously with ERR_NAME_NOT_RESOLVED.
     TIMEOUT,  // Fail asynchronously with ERR_DNS_TIMEOUT.
     EMPTY,    // Return an empty response.
-    OK,       // Return a response with loopback address.
+    OK,       // Return an IP address (the accompanying IP is an argument in the
+              // Result structure, or understood as localhost when unspecified).
+  };
+
+  struct Result {
+    explicit Result(const IPAddress& ip) : type(OK), ip(ip) {}
+    explicit Result(ResultType type) : type(type) {}
+
+    ResultType type;
+    IPAddress ip;
   };
 
   // If |delay| is true, matching transactions will be delayed until triggered
   // by the consumer.
   MockDnsClientRule(const std::string& prefix_arg,
                     uint16_t qtype_arg,
-                    Result result_arg,
+                    const Result& result_arg,
                     bool delay)
       : result(result_arg),
         prefix(prefix_arg),
         qtype(qtype_arg),
         delay(delay) {}
 
   Result result;
   std::string prefix;
   uint16_t qtype;
   bool delay;
@@ skipping 20 matching lines @@
 
  private:
   DnsConfig config_;
   std::unique_ptr<MockTransactionFactory> factory_;
   std::unique_ptr<AddressSorter> address_sorter_;
 };
 
 }  // namespace net
 
 #endif  // NET_DNS_DNS_TEST_UTIL_H_