MD Settings: validate startup URLs

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 66fbb57d7032ab351624431e4c011cc756c2cbce..b1528057791073d2e037455af435fd5e308ffbe5 100644
--- a/chrome/test/data/webui/settings/cr_settings_browsertest.js
+++ b/chrome/test/data/webui/settings/cr_settings_browsertest.js
@@ -249,3 +249,25 @@ TEST_F('CrSettingsSystemPageTest', 'Restart', function() {
   mocha.run();
 });
 GEN('#endif');
+
+/**
+ * @constructor
+ * @extends {CrSettingsBrowserTest}
+ */
+function CrSettingsStartupUrlsPageTest() {}
+
+CrSettingsStartupUrlsPageTest.prototype = {
+  __proto__: CrSettingsBrowserTest.prototype,
+
+  browsePreload: 'chrome://md-settings/on_startup_page/startup_urls_page.html',
+
+  extraLibraries: CrSettingsBrowserTest.prototype.extraLibraries.concat([
+    ROOT_PATH + 'ui/webui/resources/js/promise_resolver.js',
+    'test_browser_proxy.js',
+    'startup_urls_page_test.js',
+  ]),
+};
+
+TEST_F('CrSettingsStartupUrlsPageTest', 'Validity', function() {
+  mocha.run();
+});