LayoutManager reuses shortcut Element instance for measure (#16964).
LayoutManager reuses shortcut Element instance for measure (#16964).

This change prevents the duplicate getter chain lookup
connector.getWidget().getElement() on the very hot measureConnector
method.

Change-Id: Ia59c9ef2e6bbcf9402424bc565bc9ee3977e3c6e

bmitc/vaadin,carrchang/vaadin,bmitc/vaadin,carrchang/vaadin,bmitc/vaadin,carrchang/vaadin,mittop/vaadin,bmitc/vaadin,mittop/vaadin,carrchang/vaadin,mittop/vaadin,mittop/vaadin