[Mac] Add XPC alerts to GetDisplayedNotifications

chrome/browser/notifications/platform_notification_service_impl.cc

Index: chrome/browser/notifications/platform_notification_service_impl.cc
diff --git a/chrome/browser/notifications/platform_notification_service_impl.cc b/chrome/browser/notifications/platform_notification_service_impl.cc
index 10c6a5466efe2ad66c68a8a7717c5f45d6d221e2..d7a5ac0acd79c827850a2ae42e0bafcf9d23f53a 100644
--- a/chrome/browser/notifications/platform_notification_service_impl.cc
+++ b/chrome/browser/notifications/platform_notification_service_impl.cc
@@ -389,6 +389,18 @@ bool PlatformNotificationServiceImpl::GetDisplayedNotifications(
       displayed_notifications);
 }
 
+void PlatformNotificationServiceImpl::GetDisplayedNotificationsAsync(
+    BrowserContext* browser_context,
+    const NotificationCommon::NotificationResultCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  Profile* profile = Profile::FromBrowserContext(browser_context);
+  if (!profile || profile->AsTestingProfile())
+    return;  // Tests will not have a message center.
+
+  GetNotificationDisplayService(profile)->GetDisplayedAsync(callback);
+}
+
 void PlatformNotificationServiceImpl::OnClickEventDispatchComplete(
     content::PersistentNotificationStatus status) {
   UMA_HISTOGRAM_ENUMERATION(