PreferencesManager

services/preferences/public/interfaces/preferences.mojom

 // 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.
 
 module prefs.mojom;
 
 import "mojo/common/common_custom_types.mojom";
 
 // Used to subscribe to preference changes within PreferenceManager. After
 // requesting to observe, the current values for all requested keys are sent.
 interface PreferencesObserver {
   OnPreferencesChanged(mojo.common.mojom.DictionaryValue preferences);
 };
 
 // Manages actual read/write of preference data. Accepts observers who subscribe
 // to preferences, notifying them of changes.
 interface PreferencesManager {
-  AddObserver(array<string> preferences, PreferencesObserver client);
+  AddObserver(PreferencesObserver client);
   SetPreferences(mojo.common.mojom.DictionaryValue preferences);
+  Subscribe(array<string> preferences);
 };