Add a test for Notification.permission.

chrome/browser/notifications/notification_interactive_uitest_support.cc

Index: chrome/browser/notifications/notification_interactive_uitest_support.cc
diff --git a/chrome/browser/notifications/notification_interactive_uitest_support.cc b/chrome/browser/notifications/notification_interactive_uitest_support.cc
index 21467c6b3d2550fa858fd4977901bd93fdad9beb..ef3047e5e4537a525b6d62d0e59856494e1ee5f7 100644
--- a/chrome/browser/notifications/notification_interactive_uitest_support.cc
+++ b/chrome/browser/notifications/notification_interactive_uitest_support.cc
@@ -240,6 +240,14 @@ bool NotificationsTest::RequestPermissionAndWait(Browser* browser) {
   return observer.request_shown();
 }
 
+std::string NotificationsTest::QueryPermissionStatus(Browser* browser) {
+  std::string result;
+  content::WebContents* web_contents = GetActiveWebContents(browser);
+  EXPECT_TRUE(content::ExecuteScriptAndExtractString(
+      web_contents, "queryPermissionStatus();", &result));
+  return result;
+}
+
 bool NotificationsTest::CancelNotification(const char* notification_id,
                                            Browser* browser) {
   std::string script =
@@ -293,6 +301,12 @@ content::WebContents* NotificationsTest::GetActiveWebContents(
   return browser->tab_strip_model()->GetActiveWebContents();
 }
 
+void NotificationsTest::EnablePermissionsEmbargo() {
+  feature_list_.InitWithFeatures({features::kBlockPromptsIfDismissedOften,
+                                  features::kBlockPromptsIfIgnoredOften},
+                                 {});
+}
+
 void NotificationsTest::EnableFullscreenNotifications() {
   feature_list_.InitWithFeatures(
       {features::kPreferHtmlOverPlugins,