[SyncFS] Clear dirty flag on changelist application phase

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 cfd745d94ece7a99ac2d1b8b77c8575b8fa07d33..9f31aa0726554448fd90b386f63695b617715d90 100644
--- a/chrome/browser/sync_file_system/drive_backend/metadata_database.h
+++ b/chrome/browser/sync_file_system/drive_backend/metadata_database.h
@@ -343,6 +343,10 @@ class MetadataDatabase {
   // Sets |app_ids| to a list of all registered app ids.
   void GetRegisteredAppIDs(std::vector<std::string>* app_ids);
 
+  // Clears dirty flag of trackers that can be cleared without external
+  // interactien.
+  void SweepDirtyTrackers(const SyncStatusCallback& callback);
+
  private:
   friend class MetadataDatabaseTest;
   struct CreateParam;
@@ -403,6 +407,8 @@ class MetadataDatabase {
 
   void DetachFromSequence();
 
+  void VisitTrackerToSweep(std::vector<int64>* tracker_ids, int64 tracker_id);
+
   scoped_refptr<base::SequencedTaskRunner> worker_task_runner_;
   base::FilePath database_path_;
   leveldb::Env* env_override_;