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

chrome/browser/sync_file_system/drive_backend/metadata_database.h

Index: chrome/browser/sync_file_system/drive_backend/metadata_database.h
diff --git a/chrome/browser/sync_file_system/drive_backend/metadata_database.h b/chrome/browser/sync_file_system/drive_backend/metadata_database.h
index aec156fae1ffde76b8c1fdca3cc850f5760ea68b..f63c57c54eb91703eacd67dd4ebb74d91a596c0e 100644
--- a/chrome/browser/sync_file_system/drive_backend/metadata_database.h
+++ b/chrome/browser/sync_file_system/drive_backend/metadata_database.h
@@ -137,6 +137,14 @@ class MetadataDatabase {
       const base::FilePath& database_path,
       leveldb::Env* env_override,
       const CreateCallback& callback);
+
+  // TODO(peria): Deprecate this method, after dropping on-memory index.
+  static void CreateOnWorkerForTesting(

[tzik, 2014/09/09 08:33:28]

What does "OnWorker" mean?

[peria, 2014/09/10 05:40:12]

Renamed.

+      const scoped_refptr<base::SequencedTaskRunner>& worker_task_runner,
+      const base::FilePath& database_path,
+      bool enable_on_disk_index,
+      leveldb::Env* env_override,
+      const CreateCallback& callback);
   static SyncStatusCode CreateForTesting(
       scoped_ptr<LevelDBWrapper> db,
       bool enable_on_disk_index,
@@ -420,6 +428,7 @@ class MetadataDatabase {
   leveldb::Env* env_override_;
   scoped_ptr<LevelDBWrapper> db_;
 
+  // TODO(peria): Deprecate this parameter, after dropping on-memory index.
   bool enable_on_disk_index_;
 
   int64 largest_known_change_id_;