update elements and fix some bugs

lib/paper_tooltip.dart

 // DO NOT EDIT: auto-generated with `pub run custom_element_apigen:update`
 
 /// Dart API for the polymer element `paper_tooltip`.
 @HtmlImport('paper_tooltip_nodart.html')
 library polymer_elements.lib.src.paper_tooltip.paper_tooltip;
 
 import 'dart:html';
 import 'dart:js' show JsArray, JsObject;
 import 'package:web_components/web_components.dart';
 import 'package:polymer_interop/polymer_interop.dart';
 import 'neon_animation_runner_behavior.dart';
 import 'neon_animatable_behavior.dart';
 import 'neon_animation/animations/fade_in_animation.dart';
 import 'neon_animation/animations/fade_out_animation.dart';
 
+/// Material design: [Tooltips](https://www.google.com/design/spec/components/tooltips.html)
+///
 /// `<paper-tooltip>` is a label that appears on hover and focus when the user
 /// hovers over an element with the cursor or with the keyboard. It will be centered
 /// to an anchor element specified in the `for` attribute, or, if that doesn't exist,
 /// centered to the parent node containing it.
 ///
 /// Example:
 ///
 ///     <div style="display:inline-block">
 ///       <button>Click me!</button>
 ///       <paper-tooltip>Tooltip text</paper-tooltip>
@@ skipping 18 matching lines @@
 /// ----------------|-------------|----------
 /// `--paper-tooltip-background` | The background color of the tooltip | `#616161`
 /// `--paper-tooltip-opacity` | The opacity of the tooltip | `0.9`
 /// `--paper-tooltip-text-color` | The text color of the tooltip | `white`
 /// `--paper-tooltip` | Mixin applied to the tooltip | `{}`
 @CustomElementProxy('paper-tooltip')
 class PaperTooltip extends HtmlElement with CustomElementProxyMixin, PolymerBase, NeonAnimatableBehavior, NeonAnimationRunnerBehavior {
   PaperTooltip.created() : super.created();
   factory PaperTooltip() => new Element.tag('paper-tooltip');
 
+  /// The entry and exit animations that will be played when showing and
+  /// hiding the tooltip. If you want to override this, you must ensure
+  /// that your animationConfig has the exact format below.
   get animationConfig => jsElement[r'animationConfig'];
   set animationConfig(value) { jsElement[r'animationConfig'] = (value is Map || (value is Iterable && value is! JsArray)) ? new JsObject.jsify(value) : value;}
 
+  /// The delay that will be applied before the `entry` animation is
+  /// played when showing the tooltip.
+  num get animationDelay => jsElement[r'animationDelay'];
+  set animationDelay(num value) { jsElement[r'animationDelay'] = value; }
+
   /// If true, no parts of the tooltip will ever be shown offscreen.
   bool get fitToVisibleBounds => jsElement[r'fitToVisibleBounds'];
   set fitToVisibleBounds(bool value) { jsElement[r'fitToVisibleBounds'] = value; }
 
   /// The id of the element that the tooltip is anchored to. This element
   /// must be a sibling of the tooltip.
   String get forId => jsElement[r'for'];
   set forId(String value) { jsElement[r'for'] = value; }
 
   /// This property is deprecated, but left over so that it doesn't
@@ skipping 18 matching lines @@
 
   hide() =>
       jsElement.callMethod('hide', []);
 
   show() =>
       jsElement.callMethod('show', []);
 
   updatePosition() =>
       jsElement.callMethod('updatePosition', []);
 }