update elements and fix some bugs

lib/google_streetview_pano.dart

 // DO NOT EDIT: auto-generated with `pub run custom_element_apigen:update`
 
 /// Dart API for the polymer element `google_streetview_pano`.
 @HtmlImport('google_streetview_pano_nodart.html')
 library polymer_elements.lib.src.google_streetview_pano.google_streetview_pano;
 
 import 'dart:html';
 import 'dart:js' show JsArray, JsObject;
 import 'package:web_components/web_components.dart';
 import 'package:polymer_interop/polymer_interop.dart';
@@ skipping 11 matching lines @@
 ///       disable-default-ui>
 ///     </google-streetview-pano>
 ///
 /// There are tons of great panoramas on the [Google Maps | Views page](https://www.google.com/maps/views/home?gl=us)
 ///
 /// To grab a panorama, look at its url in the address bar. For example:
 ///
 /// google.com/maps/views/view/102684927602131521305/photo/**1szTnskrdKIAAAGuu3fZRw**
 ///
 /// The hash in bold is the `pano-id`. You'll often need to dial in the `heading`, `pitch` and `zoom` manually.
+///
+/// You can also use the position attribute and set it to a position with a computed value. Example: { lat: 42.345573, lng: -71.098326 }
+///
+///     <google-streetview-pano
+///       position="[[_myComputedPosition()]]"
+///       heading="330"
+///       pitch="-2"
+///       zoom="0.8"
+///       disable-default-ui>
+///     </google-streetview-pano>
 @CustomElementProxy('google-streetview-pano')
 class GoogleStreetviewPano extends HtmlElement with CustomElementProxyMixin, PolymerBase {
   GoogleStreetviewPano.created() : super.created();
   factory GoogleStreetviewPano() => new Element.tag('google-streetview-pano');
 
   /// A Maps API key. To obtain an API key, see developers.google.com/maps/documentation/javascript/tutorial#api_key.
   String get apiKey => jsElement[r'apiKey'];
   set apiKey(String value) { jsElement[r'apiKey'] = value; }
 
   /// A Maps API for Business Client ID. To obtain a Maps API for Business Client ID, see developers.google.com/maps/documentation/business/.
@@ skipping 14 matching lines @@
   set heading(num value) { jsElement[r'heading'] = value; }
 
   /// The localized language to load the Maps API with. For more information
   /// see https://developers.google.com/maps/documentation/javascript/basics#Language
   ///
   /// Note: the Maps API defaults to the preferred language setting of the browser.
   /// Use this parameter to override that behavior.
   String get language => jsElement[r'language'];
   set language(String value) { jsElement[r'language'] = value; }
 
-  /// A comma separated list (e.g. "places,geometry") of libraries to load
-  /// with this map. Defaults to "places". For more information see
-  /// https://developers.google.com/maps/documentation/javascript/libraries.
-  String get libraries => jsElement[r'libraries'];
-  set libraries(String value) { jsElement[r'libraries'] = value; }
-
   get pano => jsElement[r'pano'];
   set pano(value) { jsElement[r'pano'] = (value is Map || (value is Iterable && value is! JsArray)) ? new JsObject.jsify(value) : value;}
 
   /// Specifies which photosphere to load
-  ///
-  /// **Required**
   String get panoId => jsElement[r'panoId'];
   set panoId(String value) { jsElement[r'panoId'] = value; }
 
   /// The camera pitch in degrees, relative to the street view vehicle. Ranges from 90° (directly upwards) to -90° (directly downwards).
   num get pitch => jsElement[r'pitch'];
   set pitch(num value) { jsElement[r'pitch'] = value; }
 
+  /// Specifies which position to load
+  get position => jsElement[r'position'];
+  set position(value) { jsElement[r'position'] = (value is Map || (value is Iterable && value is! JsArray)) ? new JsObject.jsify(value) : value;}
+
   get rAFid => jsElement[r'rAFid'];
   set rAFid(value) { jsElement[r'rAFid'] = (value is Map || (value is Iterable && value is! JsArray)) ? new JsObject.jsify(value) : value;}
 
   /// Version of the Google Maps API to use.
   String get version => jsElement[r'version'];
   set version(String value) { jsElement[r'version'] = value; }
 
   /// Sets the zoom level of the panorama. Fully zoomed-out is level 0, where the field of view is 180 degrees.
   num get zoom => jsElement[r'zoom'];
   set zoom(num value) { jsElement[r'zoom'] = value; }
 
   /// Reset the pov for the panorama.
   reset() =>
       jsElement.callMethod('reset', []);
 
   /// Cancel the slow panning animation.
   stop() =>
       jsElement.callMethod('stop', []);
 
   /// Fired every rAF. Updates the heading to create a slow pan effect
   /// Will be canceled by mouse enter or calling stop()
   update() =>
       jsElement.callMethod('update', []);
 }