Implement exponential backoff for failed Me2Me authentication attempts

remoting/host/chromoting_host.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 REMOTING_HOST_CHROMOTING_HOST_H_
 #define REMOTING_HOST_CHROMOTING_HOST_H_
 
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "base/threading/thread.h"
+#include "net/base/backoff_entry.h"
 #include "remoting/base/encoder.h"
 #include "remoting/host/capturer.h"
 #include "remoting/host/client_session.h"
 #include "remoting/host/desktop_environment.h"
 #include "remoting/host/host_key_pair.h"
 #include "remoting/host/host_status_observer.h"
 #include "remoting/host/ui_strings.h"
 #include "remoting/jingle_glue/jingle_thread.h"
 #include "remoting/jingle_glue/signal_strategy.h"
 #include "remoting/protocol/authenticator.h"
@@ skipping 173 matching lines @@
   // greater than 1, particularly if when second client can connect
   // immediately after previous one disconnected.
   int stopping_recorders_;
 
   // Tracks the internal state of the host.
   State state_;
 
   // Configuration of the protocol.
   scoped_ptr<protocol::CandidateSessionConfig> protocol_config_;
 
+  // Login backoff state.
+  net::BackoffEntry login_backoff_;
+
   // Flags used for RejectAuthenticatingClient().
   bool authenticating_client_;
   bool reject_authenticating_client_;
 
   // Stores list of tasks that should be executed when we finish
   // shutdown. Used only while |state_| is set to kStopping.
   std::vector<base::Closure> shutdown_tasks_;
 
   // TODO(sergeyu): The following members do not belong to
   // ChromotingHost and should be moved elsewhere.
   UiStrings ui_strings_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromotingHost);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_CHROMOTING_HOST_H_