Thanks Thomas. Final code for reference:
import com.google.gwt.user.client.Command;
private static native final String getVisibilityState() /*-{
return $doc.visibilityState;
}-*/;
private static native final void listenForVisibilityChange(Command onChange)
/*-{
$doc.addEventListener("visibilitychange", function() {
$entry([email protected]::execute(*)());
}, false);
}-*/;
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