[Chrome OS] Attempt offline and online login simultaneously

chrome/browser/chromeos/cros/cryptohome_library.h

 // Copyright (c) 2010 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 CHROME_BROWSER_CHROMEOS_CROS_CRYPTOHOME_LIBRARY_H_
 #define CHROME_BROWSER_CHROMEOS_CROS_CRYPTOHOME_LIBRARY_H_
 #pragma once
 
 #include <string>
 
@@ skipping 66 matching lines @@
                           Delegate* callback) = 0;
 
   // Asks cryptohomed to mount a tmpfs for BWSI mode.
   virtual bool MountForBwsi(int* error_code) = 0;
 
   // Asks cryptohomed to asynchronously to mount a tmpfs for BWSI mode.
   // Returns true if the attempt is successfully initiated.
   // d->OnComplete() will be called with status info on completion.
   virtual bool AsyncMountForBwsi(Delegate* callback) = 0;
 
+  // Asks cryptohomed to unmount the currently mounted cryptohome.
+  // Returns false if the cryptohome could not be unmounted, true otherwise.
+  virtual bool Unmount() = 0;
+
   // Asks cryptohomed to try to find the cryptohome for |user_email| and then
   // nuke it.
   virtual bool Remove(const std::string& user_email) = 0;
 
   // Asks cryptohomed to asynchronously try to find the cryptohome for
   // |user_email| and then nuke it.
   virtual bool AsyncRemove(const std::string& user_email,
                            Delegate* callback) = 0;
 
   // Asks cryptohomed if a drive is currently mounted.
   virtual bool IsMounted() = 0;
 
   // Asks cryptohomed for the system salt.
   virtual CryptohomeBlob GetSystemSalt() = 0;
 
   // Factory function, creates a new instance and returns ownership.
   // For normal usage, access the singleton via CrosLibrary::Get().
   static CryptohomeLibrary* GetImpl(bool stub);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CROS_CRYPTOHOME_LIBRARY_H_