[third_party] add polymer 1.2.3

polymer_1.2.3/bower_components/paper-spinner/README.md

Index: polymer_1.2.3/bower_components/paper-spinner/README.md
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+<!---
+
+This README is automatically generated from the comments in these files:
+paper-spinner-behavior.html  paper-spinner-lite.html  paper-spinner.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-spinner.svg?branch=master)](https://travis-ci.org/PolymerElements/paper-spinner)
+
+_[Demo and API Docs](https://elements.polymer-project.org/elements/paper-spinner)_
+
+
+##&lt;paper-spinner&gt;
+
+
+Material design: [Progress & activity](https://www.google.com/design/spec/components/progress-activity.html)
+
+Element providing a multiple color material design circular spinner.
+
+    <paper-spinner active></paper-spinner>
+
+The default spinner cycles between four layers of colors; by default they are
+blue, red, yellow and green. It can be customized to cycle between four different
+colors. Use <paper-spinner-lite> for single color spinners.
+
+### Accessibility
+
+Alt attribute should be set to provide adequate context for accessibility. If not provided,
+it defaults to 'loading'.
+Empty alt can be provided to mark the element as decorative if alternative content is provided
+in another form (e.g. a text block following the spinner).
+
+    <paper-spinner alt="Loading contacts list" active></paper-spinner>
+
+### Styling
+
+The following custom properties and mixins are available for styling:
+
+Custom property | Description | Default
+----------------|-------------|----------
+`--paper-spinner-layer-1-color` | Color of the first spinner rotation | `--google-blue-500`
+`--paper-spinner-layer-2-color` | Color of the second spinner rotation | `--google-red-500`
+`--paper-spinner-layer-3-color` | Color of the third spinner rotation | `--google-yellow-500`
+`--paper-spinner-layer-4-color` | Color of the fourth spinner rotation | `--google-green-500`
+
+
+
+##&lt;paper-spinner-lite&gt;
+
+
+Material design: [Progress & activity](https://www.google.com/design/spec/components/progress-activity.html)
+
+Element providing a single color material design circular spinner.
+
+    <paper-spinner-lite active></paper-spinner-lite>
+
+The default spinner is blue. It can be customized to be a different color.
+
+### Accessibility
+
+Alt attribute should be set to provide adequate context for accessibility. If not provided,
+it defaults to 'loading'.
+Empty alt can be provided to mark the element as decorative if alternative content is provided
+in another form (e.g. a text block following the spinner).
+
+    <paper-spinner-lite alt="Loading contacts list" active></paper-spinner-lite>
+
+### Styling
+
+The following custom properties and mixins are available for styling:
+
+Custom property | Description | Default
+----------------|-------------|----------
+`--paper-spinner-color` | Color of the spinner | `--google-blue-500`
+
+
+
+<!-- No docs for Polymer.PaperSpinnerBehavior found. -->