Retrive displayed notifications asynchronously

chrome/browser/notifications/notification_platform_bridge_mac.h

Index: chrome/browser/notifications/notification_platform_bridge_mac.h
diff --git a/chrome/browser/notifications/notification_platform_bridge_mac.h b/chrome/browser/notifications/notification_platform_bridge_mac.h
index 43ab69fb877b9b43d8bfb713442fe50b7a966044..ca6b220d56d131dc8faefe08757b8e7d76e88085 100644
--- a/chrome/browser/notifications/notification_platform_bridge_mac.h
+++ b/chrome/browser/notifications/notification_platform_bridge_mac.h
@@ -42,6 +42,10 @@ class NotificationPlatformBridgeMac : public NotificationPlatformBridge {
   bool GetDisplayed(const std::string& profile_id,
                     bool incognito,
                     std::set<std::string>* notifications) const override;
+  void GetDisplayedAsync(const std::string& profile_id,
+                         bool incognito,
+                         const NotificationCommon::NotificationResultCallback&
+                             callback) const override;
 
   // Processes a notification response generated from a user action
   // (click close, etc.).