MD Settings: Add dedicated C++ handler for restart/relaunch/powerwash.

chrome/test/data/webui/settings/test_lifetime_browser_proxy.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.
+
+cr.define('settings', function() {
+  /**
+   * A test version of LifetimeBrowserProxy.
+   *
+   * @constructor
+   * @implements {settings.LifetimeBrowserProxy}
+   * @extends {settings.TestBrowserProxy}
+   */
+  var TestLifetimeBrowserProxy = function() {
+    var methodNames = ['restart', 'relaunch'];
+    if (cr.isChromeOS)
+      methodNames.push('logOutAndRestart', 'factoryReset');
+
+    settings.TestBrowserProxy.call(this, methodNames);
+  };
+
+  TestLifetimeBrowserProxy.prototype = {
+    __proto__: settings.TestBrowserProxy.prototype,
+
+    /** @override */
+    restart: function() {
+      this.methodCalled('restart');
+    },
+
+    /** @override */
+    relaunch: function() {
+      this.methodCalled('relaunch');
+    },
+  };
+
+  if (cr.isChromeOS) {
+    /** @override */
+    TestLifetimeBrowserProxy.prototype.logOutAndRestart = function() {
+      this.methodCalled('logOutAndRestart');
+    };
+
+    /** @override */
+    TestLifetimeBrowserProxy.prototype.factoryReset = function() {
+      this.methodCalled('factoryReset');
+    };
+  }
+
+  return {
+    TestLifetimeBrowserProxy: TestLifetimeBrowserProxy,
+  };
+});