Retrive displayed notifications asynchronously

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 a3b208c932080984a698579a650e8064642d0467..dd9cf1ff6ad71fd5c10707479e0427f188bcaec8 100644
--- a/chrome/browser/notifications/platform_notification_service_impl.cc
+++ b/chrome/browser/notifications/platform_notification_service_impl.cc
@@ -383,6 +383,18 @@ 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(