Retrive displayed notifications asynchronously

chrome/browser/notifications/notification_platform_bridge.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_PLATFORM_BRIDGE_H_
 #define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_PLATFORM_BRIDGE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 26 matching lines @@
 
   // Fills in |notifications| with a set of notification ids currently being
   // displayed for a given profile.
   // The return value expresses whether the underlying platform has the
   // capability to provide displayed notifications so the empty set
   // can be disambiguated.
   virtual bool GetDisplayed(const std::string& profile_id,
                             bool incognito,
                             std::set<std::string>* notification_ids) const = 0;
 
+  // Asynchronous version of |GetDisplayed|
+  // TODO(miguelg): remove the sync version once all paths have been updated.
+  virtual void GetDisplayedAsync(
+      const std::string& profile_id,
+      bool incognito,
+      const NotificationCommon::NotificationResultCallback& callback) const = 0;
+
  protected:
   NotificationPlatformBridge() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NotificationPlatformBridge);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_PLATFORM_BRIDGE_H_