Update Polymer from 1.2.1 -> 1.2.3

third_party/polymer/v1_0/components-chromium/paper-fab/README.md

-paper-fab
-=========
 
-Material Design: <a href="http://www.google.com/design/spec/components/buttons.html">Button</a>
+<!---
+
+This README is automatically generated from the comments in these files:
+paper-fab.html
+
+Edit those files, and our readme bot will duplicate them over here!
+Edit this file, and the bot will squash your changes :)
+
+-->
+
+[![Build Status](https://travis-ci.org/PolymerElements/paper-fab.svg?branch=master)](https://travis-ci.org/PolymerElements/paper-fab)
+
+_[Demo and API Docs](https://elements.polymer-project.org/elements/paper-fab)_
+
+
+##&lt;paper-fab&gt;
+
+
+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:
 
-```html
-<link href="path/to/iron-icons/iron-icons.html" rel="import">
+    <link href="path/to/iron-icons/iron-icons.html" rel="import">
 
-<paper-fab icon="add"></paper-fab>
-<paper-fab mini icon="favorite"></paper-fab>
-<paper-fab src="star.png"></paper-fab>
-```
+    <paper-fab icon="add"></paper-fab>
+    <paper-fab mini icon="favorite"></paper-fab>
+    <paper-fab src="star.png"></paper-fab>
+
+
+### Styling
+
+The following custom properties and mixins are available for styling:
+
+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 | `{}`
+
+