Create meta table atomically.

chrome/browser/history/history_database.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/history/history_database.h"
 
 #include <algorithm>
 #include <set>
 #include <string>
 
@@ skipping 216 matching lines @@
 void HistoryDatabase::UpdateEarlyExpirationThreshold(base::Time threshold) {
   meta_table_.SetValue(kEarlyExpirationThresholdKey,
                        threshold.ToInternalValue());
   cached_early_expiration_threshold_ = threshold;
 }
 
 sql::Connection& HistoryDatabase::GetDB() {
   return db_;
 }
 
+sql::MetaTable& HistoryDatabase::GetMetaTable() {
+  return meta_table_;
+}
+
 // Migration -------------------------------------------------------------------
 
 sql::InitStatus HistoryDatabase::EnsureCurrentVersion(
     const FilePath& tmp_bookmarks_path) {
   // We can't read databases newer than we were designed for.
   if (meta_table_.GetCompatibleVersionNumber() > kCurrentVersionNumber) {
     LOG(WARNING) << "History database is too new.";
     return sql::INIT_TOO_NEW;
   }
 
@@ skipping 83 matching lines @@
       "WHERE id IN (SELECT id FROM segment_usage WHERE time_slot > 0);"));
 
   // Erase all the full text index files. These will take a while to update and
   // are less important, so we just blow them away. Same with the archived
   // database.
   needs_version_17_migration_ = true;
 }
 #endif
 
 }  // namespace history