Revert of Polymer: Remove unused paper-dialog and paper-dialog-behavior.

third_party/polymer/v1_0/components-chromium/paper-dialog-behavior/paper-dialog-shared-styles.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="../iron-flex-layout/iron-flex-layout.html">
+<link rel="import" href="../paper-styles/default-theme.html">
+<link rel="import" href="../paper-styles/typography.html">
+<link rel="import" href="../paper-styles/shadow.html">
+
+<!--
+### Styling
+
+The following custom properties and mixins are available for styling.
+
+Custom property | Description | Default
+----------------|-------------|----------
+`--paper-dialog-background-color` | Dialog background color                     | `--primary-background-color`
+`--paper-dialog-color`            | Dialog foreground color                     | `--primary-text-color`
+`--paper-dialog`                  | Mixin applied to the dialog                 | `{}`
+`--paper-dialog-title`            | Mixin applied to the title (`<h2>`) element | `{}`
+`--paper-dialog-button-color`     | Button area foreground color                | `--default-primary-color`
+-->
+
+<dom-module id="paper-dialog-shared-styles">
+  <template>
+    <style>
+      :host {
+        display: block;
+        margin: 24px 40px;
+
+        background: var(--paper-dialog-background-color, --primary-background-color);
+        color: var(--paper-dialog-color, --primary-text-color);
+
+        @apply(--paper-font-body1);
+        @apply(--shadow-elevation-16dp);
+        @apply(--paper-dialog);
+      }
+
+      :host > ::content > * {
+        margin-top: 20px;
+        padding: 0 24px;
+      }
+
+      :host > ::content > .no-padding {
+        padding: 0;
+      }
+
+      :host > ::content > *:first-child {
+        margin-top: 24px;
+      }
+
+      :host > ::content > *:last-child {
+        margin-bottom: 24px;
+      }
+
+      :host > ::content h2 {
+        position: relative;
+        margin: 0;
+        @apply(--paper-font-title);
+
+        @apply(--paper-dialog-title);
+      }
+
+      :host > ::content .buttons {
+        position: relative;
+        padding: 8px 8px 8px 24px;
+        margin: 0;
+
+        color: var(--paper-dialog-button-color, --primary-color);
+
+        @apply(--layout-horizontal);
+        @apply(--layout-end-justified);
+      }
+    </style>
+  </template>
+</dom-module>