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

chrome/browser/sync/glue/bookmark_change_processor.h

Index: chrome/browser/sync/glue/bookmark_change_processor.h
diff --git a/chrome/browser/sync/glue/bookmark_change_processor.h b/chrome/browser/sync/glue/bookmark_change_processor.h
index ffa3aedc3845efdf32d49097c527ded31f0f4d42..7adc252250686bdd3914d1204fe151735dea3983 100644
--- a/chrome/browser/sync/glue/bookmark_change_processor.h
+++ b/chrome/browser/sync/glue/bookmark_change_processor.h
@@ -114,6 +114,13 @@ class BookmarkChangeProcessor : public BookmarkModelObserver,
                               BookmarkModelAssociator* associator,
                               DataTypeErrorHandler* error_handler);
 
+  // Update transaction version of |model| and |nodes| to |new_version| if
+  // it's valid.
+  static void UpdateTransactionVersion(
+      int64 new_version,
+      BookmarkModel* model,
+      const std::vector<const BookmarkNode*>& nodes);
+
  protected:
   virtual void StartImpl(Profile* profile) OVERRIDE;