Pref service: Filter updates from read-only pref stores.

services/preferences/public/cpp/pref_store_impl.h

 // Copyright 2017 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 SERVICES_PREFERENCES_PUBLIC_CPP_PREF_STORE_IMPL_H_
 #define SERVICES_PREFERENCES_PUBLIC_CPP_PREF_STORE_IMPL_H_
 
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "components/prefs/pref_store.h"
 #include "components/prefs/pref_value_store.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "services/preferences/public/interfaces/preferences.mojom.h"
 
 namespace prefs {
 
 // Wraps an actual PrefStore implementation and exposes it as a
 // mojom::PrefStore interface.
 class PrefStoreImpl : public ::PrefStore::Observer, public mojom::PrefStore {
  public:
   PrefStoreImpl(scoped_refptr<::PrefStore> pref_store,
                 mojom::PrefStoreRequest request);
   ~PrefStoreImpl() override;
 
   // The created instance is registered in and owned by the
   // |mojom::PrefStoreRegistry|.
   static std::unique_ptr<PrefStoreImpl> Create(
-      mojom::PrefStoreRegistryPtr registry_ptr,
+      mojom::PrefStoreRegistry* registry_ptr,
       scoped_refptr<::PrefStore> pref_store,
       PrefValueStore::PrefStoreType type);
 
  private:
+  class Observer;
+
   // PrefStore::Observer:
   void OnPrefValueChanged(const std::string& key) override;
   void OnInitializationCompleted(bool succeeded) override;
 
   // prefs::mojom::PrefStore:
-  void AddObserver(const AddObserverCallback& callback) override;
+  void AddObserver(const std::vector<std::string>& prefs_to_observe,
+                   const AddObserverCallback& callback) override;
 
   // The backing store we observer for changes.
   scoped_refptr<::PrefStore> backing_pref_store_;
 
   // Observers we notify when |backing_pref_store_| changes.
-  std::vector<mojom::PrefStoreObserverPtr> observers_;
+  std::vector<Observer> observers_;
 
   // True when the |backing_pref_store_| is initialized, either because it was
   // passed already initialized in the constructor or after
   // OnInitializationCompleted was called.
   bool backing_pref_store_initialized_;
 
   mojo::Binding<mojom::PrefStore> binding_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefStoreImpl);
 };
 
 }  // namespace prefs
 
 #endif  // SERVICES_PREFERENCES_PUBLIC_CPP_PREF_STORE_IMPL_H_