Make GetDisplayedNotifications asynchronous.

chrome/browser/notifications/notification_platform_bridge_android.h

 // Copyright 2014 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_ANDROID_H_
 #define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_PLATFORM_BRIDGE_ANDROID_H_
 
 #include <jni.h>
 #include <stdint.h>
 #include <map>
@@ skipping 51 matching lines @@
       jboolean by_user);
 
   // NotificationPlatformBridge implementation.
   void Display(NotificationCommon::Type notification_type,
                const std::string& notification_id,
                const std::string& profile_id,
                bool incognito,
                const Notification& notification) override;
   void Close(const std::string& profile_id,
              const std::string& notification_id) override;
-  bool GetDisplayed(const std::string& profile_id,
-                    bool incognito,
-                    std::set<std::string>* notifications) const override;
+  void GetDisplayed(
+      const std::string& profile_id,
+      bool incognito,
+      const DisplayedNotificationsCallback& callback) const override;
 
   static bool RegisterNotificationPlatformBridge(JNIEnv* env);
 
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
  private:
   // Contains information necessary in order to enable closing notifications
   // that were not created by this instance of the manager. This list may not
   // contain the notifications that have not been interacted with since the last
   // restart of Chrome.
@@ skipping 14 matching lines @@
   // notifications are created by the content/ layer.
   std::map<std::string, RegeneratedNotificationInfo>
       regenerated_notification_infos_;
 
   base::android::ScopedJavaGlobalRef<jobject> java_object_;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationPlatformBridgeAndroid);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_PLATFORM_BRIDGE_ANDROID_H_