A TileLayerOverlay augments the map with a {@link TileLayer}. It implements the {@link Overlay} interface and is added to the map using the{@link com.google.gwt.maps.client.MapWidget#addOverlay(Overlay)} method. TheTileLayer is presented on top of the existing map imagery. To replace the imagery instead, put the TileLayer inside a custom {@link com.google.gwt.maps.client.MapType MapType}.
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