update elements and fix some bugs

lib/google_map_point.dart

+// DO NOT EDIT: auto-generated with `pub run custom_element_apigen:update`
+
+/// Dart API for the polymer element `google_map_point`.
+@HtmlImport('google_map_point_nodart.html')
+library polymer_elements.lib.src.google_map.google_map_point;
+
+import 'dart:html';
+import 'dart:js' show JsArray, JsObject;
+import 'package:web_components/web_components.dart';
+import 'package:polymer_interop/polymer_interop.dart';
+import 'google_maps_api.dart';
+
+/// The `google-map-point` element represents a point on a map. It's used as a child of other
+/// google-map-* elements.
+///
+/// <b>Example</b>—points defining a semi-translucent blue triangle:
+///
+///     <google-map latitude="37.77493" longitude="-122.41942">
+///       <google-map-poly closed fill-color="blue" fill-opacity=".5">
+///         <google-map-point latitude="36.77493" longitude="-121.41942"></google-map-point>
+///         <google-map-point latitude="38.77493" longitude="-122.41942"></google-map-point>
+///         <google-map-point latitude="36.77493" longitude="-123.41942"></google-map-point>
+///       </google-map-poly>
+///     </google-map>
+@CustomElementProxy('google-map-point')
+class GoogleMapPoint extends HtmlElement with CustomElementProxyMixin, PolymerBase {
+  GoogleMapPoint.created() : super.created();
+  factory GoogleMapPoint() => new Element.tag('google-map-point');
+
+  /// The point's latitude coordinate.
+  num get latitude => jsElement[r'latitude'];
+  set latitude(num value) { jsElement[r'latitude'] = value; }
+
+  /// The point's longitude coordinate.
+  num get longitude => jsElement[r'longitude'];
+  set longitude(num value) { jsElement[r'longitude'] = value; }
+
+  /// Returns the point as a Google Maps LatLng object.
+  getPosition() =>
+      jsElement.callMethod('getPosition', []);
+}