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

chrome/test/data/webui/settings/system_page_tests.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_system_page', function() {
+  /** @const {boolean} */
+  var HARDWARE_ACCELERATION_AT_STARTUP = true;
+
+  /**
+   * @constructor
+   * @extends {TestBrowserProxy}
+   * @implements {settings.SystemPageBrowserProxy}
+   */
+  function TestSystemPageBrowserProxy() {
+    settings.TestBrowserProxy.call(this, ['restartBrowser']);
+  }
+
+  TestSystemPageBrowserProxy.prototype = {
+    __proto__: settings.TestBrowserProxy.prototype,
+
+    /** @override */
+    changeProxySettings: assertNotReached,
+
+    /** @override */
+    restartBrowser: function() {
+      this.methodCalled('restartBrowser');
+    },
+
+    /** @override */
+    wasHardwareAccelerationEnabledAtStartup: function() {
+      return HARDWARE_ACCELERATION_AT_STARTUP;
+    },
+  };
+
+  suite('SettingsDevicePage', function() {
+    /** @type {settings.TestSystemPageBrowserProxy} */
+    var testBrowserProxy;
+
+    /** @type {SettingsSystemPageElement} */
+    var systemPage;
+
+    setup(function() {
+      testBrowserProxy = new TestSystemPageBrowserProxy;
+      settings.SystemPageBrowserProxyImpl.instance_ = testBrowserProxy;
+
+      systemPage = document.createElement('settings-system-page');
+      systemPage.set('prefs', {
+        background_mode: {
+          enabled: {
+            key: 'background_mode.enabled',
+            type: chrome.settingsPrivate.PrefType.BOOLEAN,
+            value: true,
+          },
+        },
+        hardware_acceleration_mode: {
+          enabled: {
+            key: 'hardware_acceleration_mode.enabled',
+            type: chrome.settingsPrivate.PrefType.BOOLEAN,
+            value: HARDWARE_ACCELERATION_AT_STARTUP,
+          },
+        },
+      });
+      document.body.appendChild(systemPage);
+    });
+
+    teardown(function() { systemPage.remove(); });
+
+    test('restart button', function() {
+      var checkbox = systemPage.$$('#hardware-acceleration settings-checkbox');
+      expectEquals(checkbox.checked, HARDWARE_ACCELERATION_AT_STARTUP);
+
+      // Restart button should be hidden by default.
+      expectFalse(!!systemPage.$$('#hardware-acceleration paper-button'));
+
+      systemPage.set('prefs.hardware_acceleration_mode.enabled.value',
+                     !HARDWARE_ACCELERATION_AT_STARTUP);
+      Polymer.dom.flush();
+      expectNotEquals(checkbox.checked, HARDWARE_ACCELERATION_AT_STARTUP);
+
+      var restart = systemPage.$$('#hardware-acceleration paper-button');
+      expectTrue(!!restart);  // The "RESTART" button should be showing now.
+
+      MockInteractions.tap(restart);
+      return testBrowserProxy.whenCalled('restartBrowser');
+    });
+  });
+});