[third_party] add polymer 1.2.3

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

Index: polymer_1.2.3/bower_components/paper-card/README.md
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+<!---
+
+This README is automatically generated from the comments in these files:
+paper-card.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-card.svg?branch=master)](https://travis-ci.org/PolymerElements/paper-card)
+
+_[Demo and API Docs](https://elements.polymer-project.org/elements/paper-card)_
+
+
+##&lt;paper-card&gt;
+
+
+Material design: [Cards](https://www.google.com/design/spec/components/cards.html)
+
+`paper-card` is a container with a drop shadow.
+
+Example:
+
+    <paper-card heading="Card Title">
+      <div class="card-content">Some content</div>
+      <div class="card-actions">
+        <paper-button>Some action</paper-button>
+      </div>
+    </paper-card>
+
+Example - top card image:
+
+    <paper-card heading="Card Title" image="/path/to/image.png">
+      ...
+    </paper-card>
+
+### Accessibility
+
+By default, the `aria-label` will be set to the value of the `heading` attribute.
+
+### Styling
+
+The following custom properties and mixins are available for styling:
+
+Custom property | Description | Default
+----------------|-------------|----------
+`--paper-card-header-color` | The color of the header text | `#000`
+`--paper-card-header` | Mixin applied to the card header section | `{}`
+`--paper-card-header-text` | Mixin applied to the title in the card header section | `{}`
+`--paper-card-header-image` | Mixin applied to the image in the card header section | `{}`
+`--paper-card-header-image-text` | Mixin applied to the text overlapping the image in the card header section | `{}`
+`--paper-card-content` | Mixin applied to the card content section| `{}`
+`--paper-card-actions` | Mixin applied to the card action section | `{}`
+`--paper-card` | Mixin applied to the card | `{}`
+
+