[SyncFS] Add RemoteToLocalSyncer skeleton

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 877 matching lines @@
     MakeTrackerActive(tracker->tracker_id(), batch.get());
   if (tracker->dirty() && !ShouldKeepDirty(*tracker)) {
     tracker->set_dirty(false);
     dirty_trackers_.erase(tracker);
   }
   PutTrackerToBatch(*tracker, batch.get());
 
   WriteToDatabase(batch.Pass(), callback);
 }
 
+bool MetadataDatabase::GetNormalPriorityDirtyTracker(FileTracker* tracker) {
+  // TODO(tzik): Split |dirty_trackers| to |normal_priority_dirty_trackers|
+  // and |low_priority_dirty_trackers|.
+  // Add a function to mark a dirty tracker low priority.
+  NOTIMPLEMENTED();
+  return false;
+}
+
+bool MetadataDatabase::GetLowPriorityDirtyTracker(FileTracker* tracker) {
+  NOTIMPLEMENTED();
+  return false;
+}
+
+void MetadataDatabase::ResolveTrivialDirtiness(
+    int64 tracker_id,
+    const SyncStatusCallback& callback) {
+  NOTIMPLEMENTED();
+  callback.Run(SYNC_STATUS_FAILED);
+}
+
 MetadataDatabase::MetadataDatabase(base::SequencedTaskRunner* task_runner)
     : task_runner_(task_runner), weak_ptr_factory_(this) {
   DCHECK(task_runner);
 }
 
 // static
 void MetadataDatabase::CreateOnTaskRunner(
     base::SingleThreadTaskRunner* callback_runner,
     base::SequencedTaskRunner* task_runner,
     const base::FilePath& database_path,
@@ skipping 557 matching lines @@
       FROM_HERE,
       base::Bind(&leveldb::DB::Write,
                  base::Unretained(db_.get()),
                  leveldb::WriteOptions(),
                  base::Owned(batch.release())),
       base::Bind(&AdaptLevelDBStatusToSyncStatusCode, callback));
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system