feat(google-maps): Add Layer components.

Fix circleci error with MapBaseLayer not being part of a module.

Author: mbehrlich

src/google-maps/google-maps-module.ts

@@ -9,6 +9,7 @@
 import {NgModule} from '@angular/core';
 
 import {GoogleMap} from './google-map/google-map';
+import {MapBaseLayer} from './map-base-layer';
 import {MapBicyclingLayer} from './map-bicycling-layer/map-bicycling-layer';
 import {MapCircle} from './map-circle/map-circle';
 import {MapGroundOverlay} from './map-ground-overlay/map-ground-overlay';
@@ -22,6 +23,7 @@ import {MapTransitLayer} from './map-transit-layer/map-transit-layer';
 
 const COMPONENTS = [
   GoogleMap,
+  MapBaseLayer,
   MapBicyclingLayer,
   MapCircle,
   MapGroundOverlay,

src/google-maps/public-api.ts

@@ -9,6 +9,7 @@
 export {GoogleMap} from './google-map/google-map';
 export {GoogleMapsModule} from './google-maps-module';
 export {MapAnchorPoint} from './map-anchor-point';
+export {MapBaseLayer} from './map-base-layer';
 export {MapBicyclingLayer} from './map-bicycling-layer/map-bicycling-layer';
 export {MapCircle} from './map-circle/map-circle';
 export {MapGroundOverlay} from './map-ground-overlay/map-ground-overlay';