[Sync] Fix sync_listen_notifications to use a real host resolver

sync/tools/sync_listen_notifications.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 <cstdio>
 #include <string>
 
 #include "base/at_exit.h"
 #include "base/base64.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
 #include "base/threading/thread.h"
 #include "jingle/notifier/base/notification_method.h"
 #include "jingle/notifier/base/notifier_options.h"
 #include "net/base/host_port_pair.h"
+#include "net/base/host_resolver.h"
 #include "net/url_request/url_request_test_util.h"
 #include "sync/notifier/invalidation_state_tracker.h"
 #include "sync/notifier/sync_notifier.h"
 #include "sync/notifier/sync_notifier_factory.h"
 #include "sync/notifier/sync_notifier_observer.h"
 #include "sync/syncable/model_type.h"
 #include "sync/syncable/model_type_payload_map.h"
 
 // This is a simple utility that initializes a sync notifier and
 // listens to any received notifications.
@@ skipping 89 matching lines @@
 
   if (command_line.HasSwitch(kNotificationMethodSwitch)) {
     notifier_options.notification_method =
         notifier::StringToNotificationMethod(
             command_line.GetSwitchValueASCII(kNotificationMethodSwitch));
   }
 
   return notifier_options;
 }
 
+// Needed to use a real host resolver.
+class MyTestURLRequestContext : public TestURLRequestContext {
+ public:
+  MyTestURLRequestContext() : TestURLRequestContext(true) {
+    context_storage_.set_host_resolver(
+        net::CreateSystemHostResolver(
+            net::HostResolver::kDefaultParallelism,
+            net::HostResolver::kDefaultRetryAttempts,
+            NULL));
+    Init();
+  }
+
+  virtual ~MyTestURLRequestContext() {}
+};
+
+class MyTestURLRequestContextGetter : public TestURLRequestContextGetter {
+ public:
+  explicit MyTestURLRequestContextGetter(
+      const scoped_refptr<base::MessageLoopProxy>& io_message_loop_proxy)
+      : TestURLRequestContextGetter(io_message_loop_proxy) {}
+
+  virtual TestURLRequestContext* GetURLRequestContext() OVERRIDE {
+    // Construct |context_| lazily so it gets constructed on the right
+    // thread (the IO thread).
+    if (!context_.get())
+      context_.reset(new MyTestURLRequestContext());
+    return context_.get();
+  }
+
+ private:
+  virtual ~MyTestURLRequestContextGetter() {}
+
+  scoped_ptr<MyTestURLRequestContext> context_;
+};
+
 }  // namespace
 
 int main(int argc, char* argv[]) {
   base::AtExitManager exit_manager;
   CommandLine::Init(argc, argv);
   logging::InitLogging(
       NULL,
       logging::LOG_ONLY_TO_SYSTEM_DEBUG_LOG,
       logging::LOCK_LOG_FILE,
       logging::DELETE_OLD_LOG_FILE,
@@ skipping 22 matching lines @@
                 argv[0],
                 kEmailSwitch, kTokenSwitch, kHostPortSwitch,
                 kTrySslTcpFirstSwitch, kAllowInsecureConnectionSwitch,
                 kNotificationMethodSwitch);
     return -1;
   }
 
   const notifier::NotifierOptions& notifier_options =
       ParseNotifierOptions(
           command_line,
-          new TestURLRequestContextGetter(io_thread.message_loop_proxy()));
+          new MyTestURLRequestContextGetter(io_thread.message_loop_proxy()));
   const char kClientInfo[] = "sync_listen_notifications";
   NullInvalidationStateTracker null_invalidation_state_tracker;
   sync_notifier::SyncNotifierFactory sync_notifier_factory(
       notifier_options, kClientInfo,
       null_invalidation_state_tracker.AsWeakPtr());
   scoped_ptr<sync_notifier::SyncNotifier> sync_notifier(
       sync_notifier_factory.CreateSyncNotifier());
   NotificationPrinter notification_printer;
   sync_notifier->AddObserver(&notification_printer);
 
   const char kUniqueId[] = "fake_unique_id";
   sync_notifier->SetUniqueId(kUniqueId);
   sync_notifier->SetState("");
   sync_notifier->UpdateCredentials(email, token);
   // Listen for notifications for all known types.
   sync_notifier->UpdateEnabledTypes(syncable::ModelTypeSet::All());
 
   ui_loop.Run();
 
   sync_notifier->RemoveObserver(&notification_printer);
   io_thread.Stop();
   return 0;
 }