update elements and fix some bugs

lib/paper_fab.dart

 // DO NOT EDIT: auto-generated with `pub run custom_element_apigen:update`
 
 /// Dart API for the polymer element `paper_fab`.
 @HtmlImport('paper_fab_nodart.html')
 library polymer_elements.lib.src.paper_fab.paper_fab;
 
 import 'dart:html';
 import 'dart:js' show JsArray, JsObject;
 import 'package:web_components/web_components.dart';
 import 'package:polymer_interop/polymer_interop.dart';
 import 'paper_button_behavior.dart';
 import 'iron_button_state.dart';
 import 'iron_a11y_keys_behavior.dart';
 import 'iron_control_state.dart';
+import 'paper_ripple_behavior.dart';
+import 'iron_flex_layout/classes/iron_flex_layout.dart';
 import 'iron_icon.dart';
-import 'iron_flex_layout/classes/iron_flex_layout.dart';
-import 'default_theme.dart';
-import 'color.dart';
 import 'paper_material.dart';
 import 'paper_ripple.dart';
+import 'color.dart';
+import 'default_theme.dart';
 
-/// Material Design: <a href="http://www.google.com/design/spec/components/buttons.html">Button</a>
+/// Material design: [Floating Action Button](https://www.google.com/design/spec/components/buttons-floating-action-button.html)
 ///
 /// `paper-fab` is a floating action button. It contains an image placed in the center and
 /// comes in two sizes: regular size and a smaller size by applying the attribute `mini`. When
 /// the user touches the button, a ripple effect emanates from the center of the button.
 ///
 /// You may import `iron-icons` to use with this element, or provide a URL to a custom icon.
 /// See `iron-iconset` for more information about how to use a custom icon set.
 ///
 /// Example:
 ///
@@ skipping 10 matching lines @@
 ///
 /// Custom property | Description | Default
 /// ----------------|-------------|----------
 /// `--paper-fab-background` | The background color of the button | `--accent-color`
 /// `--paper-fab-keyboard-focus-background` | The background color of the button when focused | `--paper-pink-900`
 /// `--paper-fab-disabled-background` | The background color of the button when it's disabled | `--paper-grey-300`
 /// `--paper-fab-disabled-text` | The text color of the button when it's disabled | `--paper-grey-500`
 /// `--paper-fab` | Mixin applied to the button | `{}`
 /// `--paper-fab-mini` | Mixin applied to a mini button | `{}`
 /// `--paper-fab-disabled` | Mixin applied to a disabled button | `{}`
+/// `--paper-fab-iron-icon` | Mixin applied to the iron-icon within the button | `{}`
 @CustomElementProxy('paper-fab')
-class PaperFab extends HtmlElement with CustomElementProxyMixin, PolymerBase, IronA11yKeysBehavior, IronButtonState, IronControlState, PaperButtonBehavior {
+class PaperFab extends HtmlElement with CustomElementProxyMixin, PolymerBase, IronA11yKeysBehavior, IronButtonState, IronControlState, PaperRippleBehavior, PaperButtonBehavior {
   PaperFab.created() : super.created();
   factory PaperFab() => new Element.tag('paper-fab');
 
   /// Specifies the icon name or index in the set of icons available in
   /// the icon's icon set. If the icon property is specified,
   /// the src property should not be.
   String get icon => jsElement[r'icon'];
   set icon(String value) { jsElement[r'icon'] = value; }
 
   /// Set this to true to style this is a "mini" FAB.
   bool get mini => jsElement[r'mini'];
   set mini(bool value) { jsElement[r'mini'] = value; }
 
   /// The URL of an image for the icon. If the src property is specified,
   /// the icon property should not be.
   String get src => jsElement[r'src'];
   set src(String value) { jsElement[r'src'] = value; }
 }