Implement a basic UI flow for cryptohome encryption migration.

chromeos/login/auth/login_performer.cc

 // Copyright 2014 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.
 
 #include "chromeos/login/auth/login_performer.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 89 matching lines @@
 void LoginPerformer::OnPasswordChangeDetected() {
   password_changed_ = true;
   password_changed_callback_count_++;
   if (delegate_) {
     delegate_->OnPasswordChangeDetected();
   } else {
     NOTREACHED();
   }
 }
 
-void LoginPerformer::OnOldEncryptionDetected() {
+void LoginPerformer::OnOldEncryptionDetected(const UserContext& user_context) {
   DCHECK(task_runner_->RunsTasksOnCurrentThread());
 
   if (delegate_)
-    delegate_->OnOldEncryptionDetected();
+    delegate_->OnOldEncryptionDetected(user_context);
   else
     NOTREACHED();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // LoginPerformer, public:
 
 void LoginPerformer::NotifyWhitelistCheckFailure() {
   if (delegate_)
     delegate_->WhiteListCheckFailed(
@@ skipping 180 matching lines @@
   } else {
     NOTREACHED();
   }
   user_context_.ClearSecrets();
 }
 
 void LoginPerformer::EnsureAuthenticator() {
   authenticator_ = CreateAuthenticator();
 }
 }  // namespace chromeos