Upgrade to 1.0 and switch clients to dom-repeat where needed.

third_party/polymer/v0_8/components/paper-checkbox/paper-checkbox.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-ripple/paper-ripple.html">
 <link rel="import" href="../paper-styles/default-theme.html">
 <link rel="import" href="../paper-behaviors/paper-radio-button-behavior.html">
 
 <!--
+
 `paper-checkbox` is a button that can be either checked or unchecked.  User
 can tap the checkbox to check or uncheck it.  Usually you use checkboxes
 to allow user to select multiple options from a set.  If you have a single
 ON/OFF option, avoid using a single checkbox and use `paper-toggle-button`
 instead.
 
 Example:
 
     <paper-checkbox>label</paper-checkbox>
 
     <paper-checkbox checked> label</paper-checkbox>
 
-Styling a checkbox:
+### Styling
 
-<style is="x-style">
-  * {
-    /* Unhecked state colors. */
-    --paper-checkbox-unchecked-color: #5a5a5a;
-    --paper-checkbox-unchecked-ink-color: #5a5a5a;
+The following custom properties and mixins are available for styling:
 
-    /* Checked state colors. */
-    --paper-checkbox-checked-color: #009688;
-    --paper-checkbox-checked-ink-color: #009688;
+Custom property | Description | Default
+----------------|-------------|----------
+`--paper-checkbox-unchecked-color` | Checkbox color when the input is not checked | `--primary-text-color`
+`--paper-checkbox-unchecked-ink-color` | Selected/focus ripple color when the input is not checked | `--primary-text-color`
+`--paper-checkbox-checked-color` | Checkbox color when the input is checked | `--default-primary-color`
+`--paper-checkbox-checked-ink-color` | Selected/focus ripple color when the input is checked | `--default-primary-color`
+`--paper-checkbox-label-color` | Label color | `--primary-text-color`
+
+@demo demo/index.html
+-->
+
+<style is="custom-style">
+  :root {
+    --paper-checkbox-unchecked-color: var(--primary-text-color);
+    --paper-checkbox-unchecked-ink-color: var(--primary-text-color);
+
+    --paper-checkbox-checked-color: var(--default-primary-color);
+    --paper-checkbox-checked-ink-color: var(--default-primary-color);
+
+    --paper-checkbox-label-color: var(--primary-text-color);
   }
 </style>
 
-@group Paper Elements
-@class paper-checkbox
--->
-
 <dom-module id="paper-checkbox">
-  <style is="x-style">
-    * {
-      --paper-checkbox-unchecked-color: var(--primary-text-color);
-      --paper-checkbox-unchecked-ink-color: var(--primary-text-color);
-
-      --paper-checkbox-checked-color: var(--default-primary-color);
-      --paper-checkbox-checked-ink-color: var(--default-primary-color);
-    }
-  </style>
-
   <link rel="import" type="css" href="paper-checkbox.css">
 
   <template>
 
     <div id="checkboxContainer">
-      <paper-ripple id="ink" class="circle" recenters checked$="[[checked]]"></paper-ripple>
+      <paper-ripple id="ink" class="circle" center checked$="[[checked]]"></paper-ripple>
       <div id="checkbox" class$="[[_computeCheckboxClass(checked)]]">
         <div id="checkmark" class$="[[_computeCheckmarkClass(checked)]]"></div>
       </div>
     </div>
 
     <div id="checkboxLabel" aria-hidden="true"><content></content></div>
 
   </template>
-</dom-module>
 
-<script>
-  Polymer({
-    is: 'paper-checkbox',
+  <script>
+    Polymer({
+      is: 'paper-checkbox',
 
-    // The custom properties shim is currently an opt-in feature.
-    enableCustomStyleProperties: true,
+      behaviors: [
+        Polymer.PaperRadioButtonBehavior
+      ],
 
-    behaviors: [
-      Polymer.PaperRadioButtonBehavior
-    ],
-
-    hostAttributes: {
-      role: 'checkbox',
-      'aria-checked': false,
-      tabindex: 0
-    },
-
-    properties: {
-      /**
-       * Fired when the checked state changes due to user interaction.
-       *
-       * @event change
-       */
-
-      /**
-       * Fired when the checked state changes.
-       *
-       * @event iron-change
-       */
-
-      /**
-       * Gets or sets the state, `true` is checked and `false` is unchecked.
-       *
-       * @attribute checked
-       * @type boolean
-       * @default false
-       */
-      checked: {
-        type: Boolean,
-        value: false,
-        reflectToAttribute: true,
-        notify: true,
-        observer: '_checkedChanged'
+      hostAttributes: {
+        role: 'checkbox',
+        'aria-checked': false,
+        tabindex: 0
       },
 
-      /**
-       * If true, the user cannot interact with this element.
-       *
-       * @attribute disabled
-       * @type boolean
-       * @default false
-       */
-      disabled: {
-        type: Boolean
+      properties: {
+        /**
+         * Fired when the checked state changes due to user interaction.
+         *
+         * @event change
+         */
+
+        /**
+         * Fired when the checked state changes.
+         *
+         * @event iron-change
+         */
+
+        /**
+         * Gets or sets the state, `true` is checked and `false` is unchecked.
+         */
+        checked: {
+          type: Boolean,
+          value: false,
+          reflectToAttribute: true,
+          notify: true,
+          observer: '_checkedChanged'
+        },
+
+        /**
+         * If true, the button toggles the active state with each tap or press
+         * of the spacebar.
+         */
+        toggles: {
+          type: Boolean,
+          value: true,
+          reflectToAttribute: true
+        }
+      },
+
+      ready: function() {
+        if (Polymer.dom(this).textContent == '') {
+          this.$.checkboxLabel.hidden = true;
+        } else {
+          this.setAttribute('aria-label', Polymer.dom(this).textContent);
+        }
+        this._isReady = true;
+      },
+
+      // button-behavior hook
+      _buttonStateChanged: function() {
+        if (this.disabled) {
+          return;
+        }
+        if (this._isReady) {
+          this.checked = this.active;
+        }
+      },
+
+      _checkedChanged: function(checked) {
+        this.setAttribute('aria-checked', this.checked ? 'true' : 'false');
+        this.active = this.checked;
+        this.fire('iron-change');
+      },
+
+      _computeCheckboxClass: function(checked) {
+        if (checked) {
+          return 'checked';
+        }
+      },
+
+      _computeCheckmarkClass: function(checked) {
+        if (!checked) {
+          return 'hidden';
+        }
       }
-    },
+    })
+  </script>
 
-    ready: function() {
-      this.toggles = true;
-
-      if (this.$.checkboxLabel.textContent == '') {
-        this.$.checkboxLabel.hidden = true;
-      } else {
-        this.setAttribute('aria-label', this.$.checkboxLabel.textContent);
-      }
-    },
-
-    // button-behavior hook
-    _buttonStateChanged: function() {
-      this.checked = this.active;
-    },
-
-    _checkedChanged: function(checked) {
-      this.setAttribute('aria-checked', this.checked ? 'true' : 'false');
-      this.active = this.checked;
-      this.fire('iron-change');
-    },
-
-    _computeCheckboxClass: function(checked) {
-      if (checked) {
-        return 'checked';
-      }
-    },
-
-    _computeCheckmarkClass: function(checked) {
-      if (!checked) {
-        return 'hidden';
-      }
-    }
-  })
-</script>
+</dom-module>