Retrive displayed notifications asynchronously

chrome/browser/notifications/native_notification_display_service.cc

Index: chrome/browser/notifications/native_notification_display_service.cc
diff --git a/chrome/browser/notifications/native_notification_display_service.cc b/chrome/browser/notifications/native_notification_display_service.cc
index 2de879d0bee177fe377d7bfd028db38317b7c310..51889f79b0aa50698de18d0fdf87ccb5844eb1e4 100644
--- a/chrome/browser/notifications/native_notification_display_service.cc
+++ b/chrome/browser/notifications/native_notification_display_service.cc
@@ -15,6 +15,8 @@
 #include "chrome/browser/notifications/persistent_notification_handler.h"
 #include "chrome/browser/profiles/profile.h"
 
+#include "content/public/browser/browser_thread.h"
+
 namespace {
 
 std::string GetProfileId(Profile* profile) {
@@ -75,6 +77,12 @@ bool NativeNotificationDisplayService::GetDisplayed(
       GetProfileId(profile_), profile_->IsOffTheRecord(), notifications);
 }
 
+void NativeNotificationDisplayService::GetDisplayedAsync(
+    const NotificationCommon::NotificationResultCallback& callback) const {
+  return notification_bridge_->GetDisplayedAsync(
+      GetProfileId(profile_), profile_->IsOffTheRecord(), callback);
+}
+
 void NativeNotificationDisplayService::ProcessNotificationOperation(
     NotificationCommon::Operation operation,
     NotificationCommon::Type notification_type,