MD Settings: add a semi-functional System page

chrome/browser/resources/settings/system_page/system_page.js

+// 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 that affect how Chrome interacts with the underlying
+ * operating system (i.e. network, background processes, hardware).
+ */
+
+Polymer({
+  is: 'settings-system-page',
+
+  properties: {
+    /** @type {settings.SystemPageDelegate} */
+    delegate: {
+      type: Object,
+    },
+
+    prefs: {
+      type: Object,
+      notify: true,
+    },
+  },
+
+  /** @private */
+  onChangeProxySettingsTap_: function() {
+    this.delegate.changeProxySettings();
+  },
+});