Populate versions on individual nodes in sync model and native bookmark model.

sync/syncable/write_transaction.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_SYNCABLE_WRITE_TRANSACTION_H_
 #define SYNC_SYNCABLE_WRITE_TRANSACTION_H_
 
 #include "sync/syncable/base_transaction.h"
 #include "sync/syncable/entry_kernel.h"
 
@@ skipping 18 matching lines @@
   friend class MutableEntry;
 
   // Clears |mutations_|.
   ImmutableEntryKernelMutationMap RecordMutations();
 
   void UnlockAndNotify(const ImmutableEntryKernelMutationMap& mutations);
 
   ModelTypeSet NotifyTransactionChangingAndEnding(
       const ImmutableEntryKernelMutationMap& mutations);
 
+  // Increment versions of the models whose entries are modified and set the
+  // version on the changed entries.
+  void UpdateTransactionVersion(const std::vector<int64>& entry_changed);
+
   // Only the original fields are filled in until |RecordMutations()|.
   // We use a mutation map instead of a kernel set to avoid copying.
   EntryKernelMutationMap mutations_;
 
   DISALLOW_COPY_AND_ASSIGN(WriteTransaction);
 };
 
 }  // namespace syncable
 }  // namespace syncer
 
 #endif //  SYNC_SYNCABLE_WRITE_TRANSACTION_H_