[third_party] add polymer 1.2.3

polymer_1.2.3/bower_components/paper-icon-button/README.md

Index: polymer_1.2.3/bower_components/paper-icon-button/README.md
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+<!---
+
+This README is automatically generated from the comments in these files:
+paper-icon-button.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-icon-button.svg?branch=master)](https://travis-ci.org/PolymerElements/paper-icon-button)
+
+_[Demo and API Docs](https://elements.polymer-project.org/elements/paper-icon-button)_
+
+
+##&lt;paper-icon-button&gt;
+
+
+Material design: [Icon toggles](https://www.google.com/design/spec/components/buttons.html#buttons-toggle-buttons)
+
+`paper-icon-button` is a button with an image placed at the center. When the user touches
+the button, a ripple effect emanates from the center of the button.
+
+`paper-icon-button` includes a default icon set.  Use `icon` to specify which icon
+from the icon set to use.
+
+    <paper-icon-button icon="menu"></paper-icon-button>
+
+See [`iron-iconset`](#iron-iconset) for more information about
+how to use a custom icon set.
+
+Example:
+
+    <link href="path/to/iron-icons/iron-icons.html" rel="import">
+
+    <paper-icon-button icon="favorite"></paper-icon-button>
+    <paper-icon-button src="star.png"></paper-icon-button>
+
+### Styling
+
+Style the button with CSS as you would a normal DOM element. If you are using the icons
+provided by `iron-icons`, they will inherit the foreground color of the button.
+
+    /* make a red "favorite" button */
+    <paper-icon-button icon="favorite" style="color: red;"></paper-icon-button>
+
+By default, the ripple is the same color as the foreground at 25% opacity. You may
+customize the color using the `--paper-icon-button-ink-color` custom property.
+
+The following custom properties and mixins are available for styling:
+
+Custom property | Description | Default
+----------------|-------------|----------
+`--paper-icon-button-disabled-text` | The color of the disabled button | `--disabled-text-color`
+`--paper-icon-button-ink-color` | Selected/focus ripple color | `--primary-text-color`
+`--paper-icon-button` | Mixin for a button | `{}`
+`--paper-icon-button-disabled` | Mixin for a disabled button | `{}`
+`--paper-icon-button-hover` | Mixin for button on hover | `{}`
+
+