Open the LoginDatabase on the DB thread, not the UI thread.

components/password_manager/core/browser/login_database.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 "components/password_manager/core/browser/login_database.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/bind.h"
@@ skipping 136 matching lines @@
 }
 
 void LogAccountStat(const std::string& name, int sample) {
   LogDynamicUMAStat(name, sample, 0, 32, 6);
 }
 
 void LogTimesUsedStat(const std::string& name, int sample) {
   LogDynamicUMAStat(name, sample, 0, 100, 10);
 }
 
+// When set, LoginDatabase::Init() on any instance will artificially fail.
+bool g_simulate_init_failure_for_testing = false;
+
 }  // namespace
 
 LoginDatabase::LoginDatabase() {
 }
 
 LoginDatabase::~LoginDatabase() {
 }
 
 bool LoginDatabase::Init(const base::FilePath& db_path) {
+  if (g_simulate_init_failure_for_testing)
+    return false;
+
   // Set pragmas for a small, private database (based on WebDatabase).
   db_.set_page_size(2048);
   db_.set_cache_size(32);
   db_.set_exclusive_locking();
   db_.set_restrict_to_user();
 
   {
     // TODO(vadimt): Remove ScopedTracker below once crbug.com/138903 is fixed.
     tracked_objects::ScopedTracker tracking_profile(
         FROM_HERE_WITH_EXPLICIT_FUNCTION("138903 LoginDatabase::Init db init"));
@@ skipping 257 matching lines @@
         syncing_account_saved = true;
         break;
       }
     }
   }
   UMA_HISTOGRAM_ENUMERATION("PasswordManager.SyncingAccountState",
                             2 * sync_username.empty() + syncing_account_saved,
                             4);
 }
 
+// static
+void LoginDatabase::set_simulate_init_failure_for_testing(bool fail) {
+  g_simulate_init_failure_for_testing = fail;
+}
+
 PasswordStoreChangeList LoginDatabase::AddLogin(const PasswordForm& form) {
   PasswordStoreChangeList list;
   if (!DoesMatchConstraints(form))
     return list;
   std::string encrypted_password;
   if (EncryptedString(form.password_value, &encrypted_password) !=
           ENCRYPTION_RESULT_SUCCESS)
     return list;
 
   // You *must* change LoginTableColumns if this query changes.
@@ skipping 404 matching lines @@
 
 bool LoginDatabase::DeleteAndRecreateDatabaseFile() {
   DCHECK(db_.is_open());
   meta_table_.Reset();
   db_.Close();
   sql::Connection::Delete(db_path_);
   return Init(db_path_);
 }
 
 }  // namespace password_manager