Start session fail causes restart chrome

chromeos/dbus/session_manager_client.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 CHROMEOS_DBUS_SESSION_MANAGER_CLIENT_H_
 #define CHROMEOS_DBUS_SESSION_MANAGER_CLIENT_H_
 
 #include <map>
 #include <string>
 
@@ skipping 52 matching lines @@
   virtual void AddObserver(Observer* observer) = 0;
   virtual void RemoveObserver(Observer* observer) = 0;
   virtual bool HasObserver(Observer* observer) = 0;
 
   // Kicks off an attempt to emit the "login-prompt-visible" upstart signal.
   virtual void EmitLoginPromptVisible() = 0;
 
   // Restarts a job referenced by |pid| with the provided command line.
   virtual void RestartJob(int pid, const std::string& command_line) = 0;
 
+  // Used for StartSession. Takes a boolean indicating whether the
+  // operation was successful or not.
+  typedef base::Callback<void(bool success)> StartSessionCallback;
+
   // Starts the session for the user.
-  virtual void StartSession(const std::string& user_email) = 0;
+  virtual void StartSession(const std::string& user_email,
+                            const StartSessionCallback& callback) = 0;
 
   // Stops the current session.
   virtual void StopSession() = 0;
 
   // Starts the factory reset.
   virtual void StartDeviceWipe() = 0;
 
   // Locks the screen.
   virtual void RequestLockScreen() = 0;
 
@@ skipping 94 matching lines @@
   // Create() should be used instead.
   SessionManagerClient();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SessionManagerClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_SESSION_MANAGER_CLIENT_H_