MD Settings: implement "RESTART" button for hardware acceleration to take effect

chrome/test/data/webui/settings/cr_settings_browsertest.js

 // Copyright 2015 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 Runs the Polymer Settings tests. */
 
 /** @const {string} Path to source root. */
 var ROOT_PATH = '../../../../../';
 
 // Polymer BrowserTest fixture.
@@ skipping 182 matching lines @@
  * Test fixture for device-page.
  * @constructor
  * @extends {CrSettingsBrowserTest}
 */
 function CrSettingsDevicePageTest() {}
 
 CrSettingsDevicePageTest.prototype = {
   __proto__: CrSettingsBrowserTest.prototype,
 
   /** @override */
-  browsePreload:
-      'chrome://md-settings/device_page/device_page.html',
+  browsePreload: 'chrome://md-settings/device_page/device_page.html',
 
   /** @override */
   extraLibraries: PolymerTest.getLibraries(ROOT_PATH).concat([
     '../fake_chrome_event.js',
     'fake_settings_private.js',
     'device_page_tests.js',
   ]),
 };
 
 TEST_F('CrSettingsDevicePageTest', 'DevicePage', function() {
   mocha.run();
 });
 GEN('#endif');
+
+GEN('#if !defined(OS_CHROMEOS)');
+/**
+ * @constructor
+ * @extends {CrSettingsBrowserTest}
+*/
+function CrSettingsSystemPageTest() {}
+
+CrSettingsSystemPageTest.prototype = {
+  __proto__: CrSettingsBrowserTest.prototype,
+
+  /** @override */
+  browsePreload: 'chrome://md-settings/system_page/system_page.html',
+
+  /** @override */
+  extraLibraries: CrSettingsBrowserTest.prototype.extraLibraries.concat([
+    'test_browser_proxy.js',

[dpapad, 2016/03/21 18:17:38]

TestBrowserProxy depends on PromiseResolver, so you should need to also add
ROOT_PATH + 'ui/webui/resources/js/promise_resolver.js',

not sure how it works without this (maybe something else is pulling in that
dependency).

[Dan Beam, 2016/03/22 02:16:59]

this is probably why it worked:
https://code.google.com/p/chromium/codesearch#chromium/src/ui/webui/resources...

anyways, added explicitly (still a bummer to have to flatten deps, though)

+    'system_page_tests.js',
+  ]),
+};
+
+TEST_F('CrSettingsSystemPageTest', 'Restart', function() {
+  mocha.run();
+});
+GEN('#endif');