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

third_party/polymer/v0_8/components/paper-material/paper-material.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/shadow.html">
+
 <!--
 
 `paper-material` is a container that renders two shadows on top of each other to
 create the effect of a lifted piece of paper.
 
 Example:
 
     <paper-material elevation="1">
       ... content ...
     </paper-material>
 
 @group Paper Elements
 @class paper-material
+@demo demo/index.html
 -->
 
-<link href="../polymer/polymer.html" rel="import">
-<link href="../paper-styles/shadow.html" rel="import">
 <dom-module id="paper-material">
   <style>
     :host {
       display: block;
       position: relative;
-      mixin(--shadow-transition);
+      @apply(--shadow-transition);
     }
 
     :host([elevation="1"]) {
-      mixin(--shadow-elevation-2dp);
+      @apply(--shadow-elevation-2dp);
     }
 
     :host([elevation="2"]) {
-      mixin(--shadow-elevation-4dp);
+      @apply(--shadow-elevation-4dp);
     }
 
     :host([elevation="3"]) {
-      mixin(--shadow-elevation-6dp);
+      @apply(--shadow-elevation-6dp);
     }
 
     :host([elevation="4"]) {
-      mixin(--shadow-elevation-8dp);
+      @apply(--shadow-elevation-8dp);
     }
 
     :host([elevation="5"]) {
-      mixin(--shadow-elevation-16dp);
+      @apply(--shadow-elevation-16dp);
     }
   </style>
   <template>
     <content></content>
   </template>
 </dom-module>
 <script>
   Polymer({
     is: 'paper-material',
 
-    enableCustomStyleProperties: true,
-
     properties: {
 
       /**
        * The z-depth of this element, from 0-5. Setting to 0 will remove the
        * shadow, and each increasing number greater than 0 will be "deeper"
        * than the last.
        *
        * @attribute elevation
        * @type number
        * @default 1
@@ skipping 13 matching lines @@
        * @default false
        */
       animated: {
         type: Boolean,
         reflectToAttribute: true,
         value: false
       }
     }
   });
 </script>