update elements and fix some bugs

lib/google_map_marker.dart

Index: lib/google_map_marker.dart
diff --git a/lib/google_map_marker.dart b/lib/google_map_marker.dart
index 5a7060b4ffd396bc82e7da451372ecec17c915df..1a97501d768ba939b15aea326d75fced8fe205cf 100644
--- a/lib/google_map_marker.dart
+++ b/lib/google_map_marker.dart
@@ -40,6 +40,11 @@ class GoogleMapMarker extends HtmlElement with CustomElementProxyMixin, PolymerB
   GoogleMapMarker.created() : super.created();
   factory GoogleMapMarker() => new Element.tag('google-map-marker');
 
+  /// A animation for the marker. "DROP" or "BOUNCE". See
+  /// https://developers.google.com/maps/documentation/javascript/examples/marker-animations.
+  String get animation => jsElement[r'animation'];
+  set animation(String value) { jsElement[r'animation'] = value; }
+
   /// When true, marker *click events are automatically registered.
   bool get clickEvents => jsElement[r'clickEvents'];
   set clickEvents(bool value) { jsElement[r'clickEvents'] = value; }
@@ -72,6 +77,10 @@ class GoogleMapMarker extends HtmlElement with CustomElementProxyMixin, PolymerB
   bool get mouseEvents => jsElement[r'mouseEvents'];
   set mouseEvents(bool value) { jsElement[r'mouseEvents'] = value; }
 
+  /// Specifies whether the InfoWindow is open or not
+  bool get open => jsElement[r'open'];
+  set open(bool value) { jsElement[r'open'] = value; }
+
   /// Z-index for the marker icon.
   num get zIndex => jsElement[r'zIndex'];
   set zIndex(num value) { jsElement[r'zIndex'] = value; }