build(google-maps): add server-side rendering checks for new layers (angular#20386)

A few new layer components were added to the `google-maps` module. These changes add them to the SSR kitchen sink.

Author: crisbeto

src/universal-app/kitchen-sink/kitchen-sink.html

@@ -423,4 +423,7 @@ <h2>Google Map</h2>
     }"></map-ground-overlay>
     <map-kml-layer
       url="https://developers.google.com/maps/documentation/javascript/examples/kml/westcampus.kml"></map-kml-layer>
+    <map-traffic-layer></map-traffic-layer>
+    <map-transit-layer></map-transit-layer>
+    <map-bicycling-layer></map-bicycling-layer>
 </google-map>