Cryptohome: Notify about error in async calls if cryptohome is not ready yet.

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 21 matching lines @@
 
 } // namespace cryptohome
 
 namespace chromeos {
 
 // 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 DBusClient {
  public:
+  // Constant that will be passed to AsyncMethodCallback to indicate that
+  // cryptohome is not ready yet.
+  static const int kNotReadyAsyncId;
+
   // A callback to handle AsyncCallStatus signals.
   typedef base::Callback<void(int async_id,
                               bool return_status,
                               int return_code)>
       AsyncCallStatusHandler;
   // A callback to handle AsyncCallStatusWithData signals.
   typedef base::Callback<void(int async_id,
                               bool return_status,
                               const std::string& data)>
       AsyncCallStatusWithDataHandler;
@@ skipping 490 matching lines @@
   // Create() should be used instead.
   CryptohomeClient();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CryptohomeClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_CRYPTOHOME_CLIENT_H_