feat: Adds text placeholder for AC widget. (#1026)

Author: willum070

samples/place-autocomplete-map/index.html

@@ -21,7 +21,6 @@
             <div
                 class="place-autocomplete-card"
                 slot="control-inline-start-block-start">
-                <p>Search for a place here:</p>
                 <gmp-place-autocomplete></gmp-place-autocomplete>
             </div>
         </gmp-map>

samples/place-autocomplete-map/index.ts

@@ -26,6 +26,9 @@ async function initMap(): Promise<void> {
         mapTypeControl: false,
     });
 
+    //@ts-ignore
+    placeAutocomplete.placeholder = 'Search for a place...';
+
     // Use the bounds_changed event to restrict results to the current map bounds.
     google.maps.event.addListener(innerMap, 'bounds_changed', async () => {
         placeAutocomplete.locationRestriction = innerMap.getBounds();