Makes migration on write error asynchronous to avoid reentrancy issues

net/quic/chromium/mock_network_change_notifier.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_QUIC_CHROMIUM_MOCK_NETWORK_CHANGE_NOTIFIER_H_
 #define NET_QUIC_CHROMIUM_MOCK_NETWORK_CHANGE_NOTIFIER_H_
 
 #include "net/base/network_change_notifier.h"
 
 namespace net {
 namespace test {
 
 class MockNetworkChangeNotifier : public NetworkChangeNotifier {
  public:
   MockNetworkChangeNotifier();
   ~MockNetworkChangeNotifier() override;
 
   ConnectionType GetCurrentConnectionType() const override;
 
   void ForceNetworkHandlesSupported();
 
   bool AreNetworkHandlesCurrentlySupported() const override;
 
   void SetConnectedNetworksList(const NetworkList& network_list);
 
   void GetCurrentConnectedNetworks(NetworkList* network_list) const override;
 
   void NotifyNetworkMadeDefault(NetworkChangeNotifier::NetworkHandle network);
 
+  void QueueNetworkMadeDefault(NetworkChangeNotifier::NetworkHandle network);

[Ryan Hamilton, 2016/09/10 16:40:34]

Can you add some comments. It's not obvious how this is different from the
previous method. 

[Jana, 2016/09/10 23:08:30]

Done.

+
   void NotifyNetworkDisconnected(NetworkChangeNotifier::NetworkHandle network);
 
+  void QueueNetworkDisconnected(NetworkChangeNotifier::NetworkHandle network);
+
  private:
   bool force_network_handles_supported_;
   NetworkChangeNotifier::NetworkList connected_networks_;
 };
 
 // Class to replace existing NetworkChangeNotifier singleton with a
 // MockNetworkChangeNotifier for a test. To use, simply create a
 // ScopedMockNetworkChangeNotifier object in the test.
 class ScopedMockNetworkChangeNotifier {
  public:
   ScopedMockNetworkChangeNotifier();
   ~ScopedMockNetworkChangeNotifier();
 
   MockNetworkChangeNotifier* mock_network_change_notifier();
 
  private:
   std::unique_ptr<NetworkChangeNotifier::DisableForTest>
       disable_network_change_notifier_for_tests_;
   std::unique_ptr<MockNetworkChangeNotifier> mock_network_change_notifier_;
 };
 
 }  // namespace test
 }  // namespace net
 
 #endif  // NET_QUIC_CHROMIUM_MOCK_NETWORK_CHANGE_NOTIFIER_H_