MD Settings: Creating a <settings-dialog> element.

chrome/browser/resources/settings/settings_dialog.js

Index: chrome/browser/resources/settings/settings_dialog.js
diff --git a/chrome/browser/resources/settings/settings_dialog.js b/chrome/browser/resources/settings/settings_dialog.js
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+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview 'settings-dialog' is a component for showing a modal dialog.
+ *
+ * @group Chrome Settings Elements
+ * @element settings-dialog
+ */
+Polymer({
+  is: 'settings-dialog',
+
+  properties: {
+    /** @override */
+    modal: {
+      type: Boolean,
+      value: true,
+    },
+  },
+
+  behaviors: [Polymer.PaperDialogBehavior],
+
+  /** @return {!PaperIconButtonElement} */
+  getCloseButton: function() {
+    return this.$.close;
+  },
+});