@Override
    protected void onEnterKeyDown(final Context context,
                                  final Element parent,
                                  final R row,
                                  final NativeEvent event,
                                  final ValueUpdater<R> valueUpdater) {
        action.accept(row, event);

        if (valueUpdater != null) {
            valueUpdater.update(row);
        }
    }
A cell containing an icon (ellipses icon by default) that when clicked
will execute an action. Useful for a simple

@param <R>
stroom-core-client-widget/src/main/java/stroom/cell/info/client/ActionCell.java