MD Settings: add tests for <controlled-button>

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

Index: chrome/test/data/webui/settings/cr_settings_browsertest.js
diff --git a/chrome/test/data/webui/settings/cr_settings_browsertest.js b/chrome/test/data/webui/settings/cr_settings_browsertest.js
index cc407ba77083b21c144674f8a64f4ca92eeb07d0..fb08baa714cc824c66658cb0446eecbe7c15fb88 100644
--- a/chrome/test/data/webui/settings/cr_settings_browsertest.js
+++ b/chrome/test/data/webui/settings/cr_settings_browsertest.js
@@ -663,7 +663,7 @@ TEST_F('CrSettingsRouteTest', 'All', function() {
 /**
  * @constructor
  * @extends {SettingsPageBrowserTest}
-*/
+ */
 function CrSettingsNonExistentRouteTest() {}
 
 CrSettingsNonExistentRouteTest.prototype = {
@@ -748,3 +748,24 @@ TEST_F('CrSettingsMainPageTest', 'All', function() {
   settings_main_page.registerTests();
   mocha.run();
 });
+
+/**
+ * @constructor
+ * @extends {CrSettingsBrowserTest}
+ */
+function CrControlledButtonTest() {}
+
+CrControlledButtonTest.prototype = {
+  __proto__: CrSettingsBrowserTest.prototype,
+
+  /** @override */
+  browsePreload: 'chrome://md-settings/controls/controlled_button.html',
+
+  extraLibraries: CrSettingsBrowserTest.prototype.extraLibraries.concat([
+    'controlled_button_tests.js',
+  ]),
+};
+
+TEST_F('CrControlledButtonTest', 'All', function() {
+  mocha.run();
+});