Convert chromeos::CryptohomeClient::TpmCanAttemptOwnership to asynchronous

chromeos/dbus/cryptohome_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_CRYPTOHOME_CLIENT_H_
 #define CHROMEOS_DBUS_CRYPTOHOME_CLIENT_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 12 matching lines @@
 // CryptohomeClient is used to communicate with the Cryptohome service.
 // All method should be called from the origin thread (UI thread) which
 // initializes the DBusThreadManager instance.
 class CHROMEOS_EXPORT CryptohomeClient {
  public:
   // A callback to handle AsyncCallStatus signals.
   typedef base::Callback<void(int async_id, bool return_status, int return_code)
                          > AsyncCallStatusHandler;
   // A callback to handle responses of AsyncXXX methods.
   typedef base::Callback<void(int async_id)> AsyncMethodCallback;
+  // A callback to handle responses of methods without result values.
+  typedef base::Callback<void(
+      DBusMethodCallStatus call_status)> VoidMethodCallback;
   // A callback to handle responses of methods returning a bool value.
   typedef base::Callback<void(DBusMethodCallStatus call_status,
                               bool result)> BoolMethodCallback;
   // A callback to handle responses of methods returning a string value.
   typedef base::Callback<void(DBusMethodCallStatus call_status,
                               const std::string& result)> StringMethodCallback;
   // A callback to handle responses of Pkcs11GetTpmTokenInfo method.
   typedef base::Callback<void(
       DBusMethodCallStatus call_status,
       const std::string& label,
@@ skipping 71 matching lines @@
   virtual void TpmGetPassword(const StringMethodCallback& callback) = 0;
 
   // Calls TpmIsOwned method and returns true when the call succeeds.
   // This method blocks until the call returns.
   virtual bool TpmIsOwned(bool* owned) = 0;
 
   // Calls TpmIsBeingOwned method and returns true when the call succeeds.
   // This method blocks until the call returns.
   virtual bool TpmIsBeingOwned(bool* owning) = 0;
 
-  // Calls TpmCanAttemptOwnership method and returns true when the call
-  // succeeds.  This method blocks until the call returns.
-  virtual bool TpmCanAttemptOwnership() = 0;
+  // Calls TpmCanAttemptOwnership method.
+  // This method tells the service that it is OK to attempt ownership.
+  virtual void TpmCanAttemptOwnership(const VoidMethodCallback& callback) = 0;
 
   // Calls TpmClearStoredPassword method and returns true when the call
   // succeeds.  This method blocks until the call returns.
   virtual bool TpmClearStoredPassword() = 0;
 
   // Calls Pkcs11IsTpmTokenReady method.
   virtual void Pkcs11IsTpmTokenReady(const BoolMethodCallback& callback) = 0;
 
   // Calls Pkcs11GetTpmTokenInfo method.
   virtual void Pkcs11GetTpmTokenInfo(
@@ skipping 32 matching lines @@
   // Create() should be used instead.
   CryptohomeClient();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CryptohomeClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_CRYPTOHOME_CLIENT_H_