Remove third_party/polymer from .gitignore

third_party/polymer/v1_0/components/paper-spinner/paper-spinner.html

-<!--
-@license
-Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
-This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
-The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
-The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
-Code distributed by Google as part of the polymer project is also
-subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
--->
-
-<link rel="import" href="../polymer/polymer.html">
-<link rel="import" href="../paper-styles/color.html">
-<link rel="import" href="../iron-flex-layout/iron-flex-layout.html">
-
-<!--
-Element providing 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 so that it uses one color only
-by setting all the layer colors to the same value.
-
-### 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`
-
-@group Paper Elements
-@element paper-spinner
-@hero hero.svg
-@demo demo/index.html
--->
-
-<dom-module id="paper-spinner">
-
-  <link rel="import" type="css" href="paper-spinner.css">
-
-  <template>
-
-    <div id="spinnerContainer" class-name="[[_spinnerContainerClassName]]">
-      <div class="spinner-layer layer-1">
-        <div class="circle-clipper left">
-          <div class="circle"></div>
-        </div><div class="gap-patch">
-          <div class="circle"></div>
-        </div><div class="circle-clipper right">
-          <div class="circle"></div>
-        </div>
-      </div>
-
-      <div class="spinner-layer layer-2">
-        <div class="circle-clipper left">
-          <div class="circle"></div>
-        </div><div class="gap-patch">
-          <div class="circle"></div>
-        </div><div class="circle-clipper right">
-          <div class="circle"></div>
-        </div>
-      </div>
-
-      <div class="spinner-layer layer-3">
-        <div class="circle-clipper left">
-          <div class="circle"></div>
-        </div><div class="gap-patch">
-          <div class="circle"></div>
-        </div><div class="circle-clipper right">
-          <div class="circle"></div>
-        </div>
-      </div>
-
-      <div class="spinner-layer layer-4">
-        <div class="circle-clipper left">
-          <div class="circle"></div>
-        </div><div class="gap-patch">
-          <div class="circle"></div>
-        </div><div class="circle-clipper right">
-          <div class="circle"></div>
-        </div>
-      </div>
-    </div>
-
-  </template>
-
-  <script>
-
-    Polymer({
-
-      is: 'paper-spinner',
-
-      listeners: {
-        'animationend': 'reset',
-        'webkitAnimationEnd': 'reset'
-      },
-
-      properties: {
-
-        /**
-         * Displays the spinner.
-         *
-         * @attribute active
-         * @type boolean
-         * @default false
-         */
-        active: {
-          type: Boolean,
-          value: false,
-          reflectToAttribute: true,
-          observer: '_activeChanged'
-        },
-
-        /**
-         * Alternative text content for accessibility support.
-         * If alt is present, it will add an aria-label whose content matches alt when active.
-         * If alt is not present, it will default to 'loading' as the alt value.
-         *
-         * @attribute alt
-         * @type string
-         * @default 'loading'
-         */
-        alt: {
-          type: String,
-          value: 'loading',
-          observer: '_altChanged'
-        },
-
-        /**
-         * True when the spinner is going from active to inactive. This is represented by a fade
-         * to 0% opacity to the user.
-         */
-        _coolingDown: {
-          type: Boolean,
-          value: false
-        },
-
-        _spinnerContainerClassName: {
-          type: String,
-          computed: '_computeSpinnerContainerClassName(active, _coolingDown)'
-        }
-
-      },
-
-      _computeSpinnerContainerClassName: function(active, coolingDown) {
-        return [
-          active || coolingDown ? 'active' : '',
-          coolingDown ? 'cooldown' : ''
-        ].join(' ');
-      },
-
-      _activeChanged: function(active, old) {
-        this._setAriaHidden(!active);
-        if (!active && old) {
-          this._coolingDown = true;
-        }
-      },
-
-      _altChanged: function(alt) {
-        // user-provided `aria-label` takes precedence over prototype default
-        if (alt === this.getPropertyInfo('alt').value) {
-          this.alt = this.getAttribute('aria-label') || alt;
-        } else {
-          this._setAriaHidden(alt==='');
-          this.setAttribute('aria-label', alt);
-        }
-      },
-
-      _setAriaHidden: function(hidden) {
-        var attr = 'aria-hidden';
-        if (hidden) {
-          this.setAttribute(attr, 'true');
-        } else {
-          this.removeAttribute(attr);
-        }
-      },
-
-      reset: function() {
-        this.active = false;
-        this._coolingDown = false;
-      }
-
-    });
-
-  </script>
-
-</dom-module>