leveldb: Reuse manifest (AKA logs) during open.

chrome/browser/sync_file_system/local/local_file_change_tracker.cc

 // Copyright 2013 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/sync_file_system/local/local_file_change_tracker.h"
 
 #include <queue>
 
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/sequenced_task_runner.h"
 #include "base/stl_util.h"
 #include "chrome/browser/sync_file_system/local/local_file_sync_status.h"
 #include "chrome/browser/sync_file_system/syncable_file_system_util.h"
 #include "storage/browser/fileapi/file_system_context.h"
 #include "storage/browser/fileapi/file_system_file_util.h"
 #include "storage/browser/fileapi/file_system_operation_context.h"
 #include "storage/common/fileapi/file_system_util.h"
+#include "third_party/leveldatabase/env_chromium.h"
 #include "third_party/leveldatabase/src/helpers/memenv/memenv.h"
 #include "third_party/leveldatabase/src/include/leveldb/db.h"
 #include "third_party/leveldatabase/src/include/leveldb/env.h"
 #include "third_party/leveldatabase/src/include/leveldb/write_batch.h"
 
 using storage::FileSystemContext;
 using storage::FileSystemFileUtil;
 using storage::FileSystemOperationContext;
 using storage::FileSystemURL;
 using storage::FileSystemURLSet;
@@ skipping 444 matching lines @@
 SyncStatusCode LocalFileChangeTracker::TrackerDB::Init(
     RecoveryOption recovery_option) {
   if (db_.get() && db_status_ == SYNC_STATUS_OK)
     return SYNC_STATUS_OK;
 
   std::string path =
       storage::FilePathToString(base_path_.Append(kDatabaseName));
   leveldb::Options options;
   options.max_open_files = 0;  // Use minimum.
   options.create_if_missing = true;
+  options.reuse_logs = leveldb_env::kDefaultLogReuseOptionValue;
   if (env_override_)
     options.env = env_override_;
   leveldb::DB* db;
   leveldb::Status status = leveldb::DB::Open(options, path, &db);
   if (status.ok()) {
     db_.reset(db);
     return SYNC_STATUS_OK;
   }
 
   HandleError(FROM_HERE, status);
@@ skipping 116 matching lines @@
   if (!status.ok() && !status.IsNotFound()) {
     HandleError(FROM_HERE, status);
     db_status_ = LevelDBStatusToSyncStatusCode(status);
     db_.reset();
     return db_status_;
   }
   return SYNC_STATUS_OK;
 }
 
 }  // namespace sync_file_system