cros: Make sure views-based lock screen is destroyed after it is dismissed.

ash/login/lock_screen_controller.cc

 // Copyright 2017 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 "ash/login/lock_screen_controller.h"
 
+#include "ash/login/ui/lock_screen.h"
 #include "chromeos/cryptohome/system_salt_getter.h"
 #include "chromeos/login/auth/user_context.h"
 
 namespace ash {
 
 LockScreenController::LockScreenController() = default;
 
 LockScreenController::~LockScreenController() = default;
 
 void LockScreenController::BindRequest(mojom::LockScreenRequest request) {
@@ skipping 17 matching lines @@
 
 void LockScreenController::ShowErrorMessage(int32_t login_attempts,
                                             const std::string& error_text,
                                             const std::string& help_link_text,
                                             int32_t help_topic_id) {
   NOTIMPLEMENTED();
 }
 
 void LockScreenController::ClearErrors() {
   NOTIMPLEMENTED();
+
+  // TODO: At the moment, we don't have a notification that authentication has
+  // succeeded. ClearErrors is delivered though after login success so we reuse
+  // that. This should be done in a mojo call like AnimateAuthenticationSuccess.
+  DestroyLockScreen();
 }
 
 void LockScreenController::DoAuthenticateUser(const AccountId& account_id,
                                               const std::string& password,
                                               bool authenticated_by_pin,
                                               const std::string& system_salt) {
   // Hash password before sending through mojo.
   // TODO(xiaoyinh): Pin is hashed differently by using a different salt and
   // a different hash algorithm. Update this part in PinStorage.
   chromeos::Key key(password);
   key.Transform(chromeos::Key::KEY_TYPE_SALTED_SHA256_TOP_HALF, system_salt);
   lock_screen_client_->AuthenticateUser(account_id, key.GetSecret(),
                                         authenticated_by_pin);
 }
 
 }  // namespace ash