sync: Expose sync functionality as functions

sync/engine/commit.h

 // Copyright (c) 2012 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.
 
 #ifndef SYNC_ENGINE_COMMIT_H_
 #define SYNC_ENGINE_COMMIT_H_
 
+#include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/util/syncer_error.h"
 
 namespace syncer {
 
 namespace sessions {
 class SyncSession;
 }
 
 class Syncer;
 
 // This function will commit batches of unsynced items to the server until the
 // number of unsynced and ready to commit items reaches zero or an error is
 // encountered.  A request to exit early will be treated as an error and will
 // abort any blocking operations.
 //
 // The Syncer parameter is provided only for access to its ExitRequested()
 // method.  This is technically unnecessary since an early exit request should
 // be detected as we attempt to contact the sync server.
 //
 // The SyncSession parameter contains pointers to various bits of state,
 // including the syncable::Directory that contains all sync items and the
 // ServerConnectionManager used to contact the server.
 SyncerError BuildAndPostCommits(
+    ModelTypeSet request_types,
     Syncer* syncer,
     sessions::SyncSession* session);
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_COMMIT_H_