[SyncFS] Test MetadataDatabaseTest using both on-memory and on-disk indexes

chrome/browser/sync_file_system/drive_backend/metadata_database.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/drive_backend/metadata_database.h"
 
 #include <algorithm>
 #include <stack>
 
 #include "base/bind.h"
@@ skipping 505 matching lines @@
 
 }  // namespace
 
 // static
 scoped_ptr<MetadataDatabase> MetadataDatabase::Create(
     const base::FilePath& database_path,
     leveldb::Env* env_override,
     SyncStatusCode* status_out) {
   bool enable_on_disk_index = !CommandLine::ForCurrentProcess()->HasSwitch(
       kDisableMetadataDatabaseOnDisk);
+  return CreateInternal(database_path, env_override, enable_on_disk_index,
+                        status_out);
+}
+
+// static
+scoped_ptr<MetadataDatabase> MetadataDatabase::CreateInternal(
+    const base::FilePath& database_path,
+    leveldb::Env* env_override,
+    bool enable_on_disk_index,
+    SyncStatusCode* status_out) {
   scoped_ptr<MetadataDatabase> metadata_database(
       new MetadataDatabase(database_path,
                            enable_on_disk_index,
                            env_override));
 
   SyncStatusCode status = metadata_database->Initialize();
   if (status == SYNC_DATABASE_ERROR_FAILED) {
     // Delete the previous instance to avoid creating a LevelDB instance for
     // the same path.
     metadata_database.reset();
@@ skipping 1245 matching lines @@
       return false;
 
   if (!parents.empty())
     return false;
 
   return true;
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system