MD Settings: add a semi-functional System page

chrome/browser/resources/settings/system_page/system_page_delegate.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 Handles interprocess communcation for the system page. */
+
+cr.define('settings', function() {
+  /** @interface */
+  function SystemPageDelegate() {}
+
+  SystemPageDelegate.prototype = {
+    /** Allows the user to change native system proxy settings. */
+    changeProxySettings: assertNotReached,
+  };
+
+  /**
+   * @constructor
+   * @implements {settings.SystemPageDelegate}
+   */
+  function SystemPageDelegateImpl() {}
+
+  SystemPageDelegateImpl.prototype = {
+    /** @override */
+    changeProxySettings: function() {
+      chrome.send('changeProxySettings');
+    },
+  };
+
+  return {
+    SystemPageDelegate: SystemPageDelegate,
+    SystemPageDelegateImpl: SystemPageDelegateImpl,
+  };
+});