Additional logging for crash mentioned in crbug.com/422918

chrome/browser/chromeos/login/existing_user_controller.cc

 // 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.
 
 #include "chrome/browser/chromeos/login/existing_user_controller.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 428 matching lines @@
     return;
   }
 
   PerformPreLoginActions(user_context);
   PerformLogin(user_context, LoginPerformer::AUTH_MODE_INTERNAL);
 }
 
 void ExistingUserController::PerformLogin(
     const UserContext& user_context,
     LoginPerformer::AuthorizationMode auth_mode) {
-  ChromeUserManager::Get()->GetUserFlow(user_context.GetUserID())->set_host(
-      host_);
+  // TODO(antrim): remove this output once crash reason is found.
+  LOG(ERROR) << "Setting flow from PerformLogin";
+  ChromeUserManager::Get()
+      ->GetUserFlow(user_context.GetUserID())
+      ->SetHost(host_);
 
   BootTimesLoader::Get()->RecordLoginAttempted();
 
   last_login_attempt_auth_flow_ = user_context.GetAuthFlow();
 
   // Use the same LoginPerformer for subsequent login as it has state
   // such as Authenticator instance.
   if (!login_performer_.get() || num_login_attempts_ <= 1) {
     // Only one instance of LoginPerformer should exist at a time.
     login_performer_.reset(NULL);
@@ skipping 727 matching lines @@
   is_login_in_progress_ = false;
 
   // Reenable clicking on other windows and status area.
   login_display_->SetUIEnabled(true);
 
   if (start_public_session_timer)
     StartPublicSessionAutoLoginTimer();
 }
 
 }  // namespace chromeos