update elements and fix some bugs

lib/iron_a11y_keys_behavior.dart

 // DO NOT EDIT: auto-generated with `pub run custom_element_apigen:update`
 
 /// Dart API for the polymer element `iron_a11y_keys_behavior`.
 @HtmlImport('iron_a11y_keys_behavior_nodart.html')
 library polymer_elements.lib.src.iron_a11y_keys_behavior.iron_a11y_keys_behavior;
 
 import 'dart:html';
 import 'dart:js' show JsArray, JsObject;
 import 'package:web_components/web_components.dart';
 import 'package:polymer_interop/polymer_interop.dart';
@@ skipping 13 matching lines @@
 @BehaviorProxy(const ['Polymer', 'IronA11yKeysBehavior'])
 abstract class IronA11yKeysBehavior implements CustomElementProxyMixin {
 
   get keyBindings => jsElement[r'keyBindings'];
   set keyBindings(value) { jsElement[r'keyBindings'] = (value is Map || (value is Iterable && value is! JsArray)) ? new JsObject.jsify(value) : value;}
 
   /// The HTMLElement that will be firing relevant KeyboardEvents.
   get keyEventTarget => jsElement[r'keyEventTarget'];
   set keyEventTarget(value) { jsElement[r'keyEventTarget'] = (value is Map || (value is Iterable && value is! JsArray)) ? new JsObject.jsify(value) : value;}
 
+  /// If true, this property will cause the implementing element to
+  /// automatically stop propagation on any handled KeyboardEvents.
+  bool get stopKeyboardEventPropagation => jsElement[r'stopKeyboardEventPropagation'];
+  set stopKeyboardEventPropagation(bool value) { jsElement[r'stopKeyboardEventPropagation'] = value; }
+
   /// Can be used to imperatively add a key binding to the implementing
   /// element. This is the imperative equivalent of declaring a keybinding
   /// in the `keyBindings` prototype property.
   addOwnKeyBinding(eventString, handlerName) =>
       jsElement.callMethod('addOwnKeyBinding', [eventString, handlerName]);
 
   keyboardEventMatchesKeys(event, eventString) =>
       jsElement.callMethod('keyboardEventMatchesKeys', [event, eventString]);
 
   /// When called, will remove all imperatively-added key bindings.
   removeOwnKeyBindings() =>
       jsElement.callMethod('removeOwnKeyBindings', []);
 
   registered() =>
       jsElement.callMethod('registered', []);
 }