AdsManagerOptions adsOptions = AdsManagerOptions.newInstance();
adsOptions.setMaxAdsOnMap(3);
adsOptions.setStyle(AdsManagerOptions.STYLE_ADUNIT);
String publisherId = "pub-1234567890123456"; // bogus publisher id
AdsManager adsManager = AdsManager.newInstance(map, publisherId, adsOptions);
adsManager.setEnabled(true);
initWidget(map);
}