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", $entry(function() {
    onchan...@com.google.gwt.user.client.Command::execute(*)();
  }), false);
}-*/;



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