Pref service: support for incognito prefs

services/preferences/persistent_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_PERSISTENT_PREF_STORE_IMPL_H_
 #define SERVICES_PREFERENCES_PERSISTENT_PREF_STORE_IMPL_H_
 
 #include <memory>
 #include <string>
 #include <unordered_map>
 #include <vector>
 
 #include "base/macros.h"
 #include "services/preferences/public/interfaces/preferences.mojom.h"
 #include "services/preferences/public/interfaces/tracked_preference_validation_delegate.mojom.h"
 
 namespace prefs {
 
-class PersistentPrefStoreImpl : public PrefStore::Observer {
+class PersistentPrefStoreImpl : public PrefStore::Observer,
+                                public mojom::PrefStore {
  public:
   using ObservedPrefs = std::set<std::string>;
 
   // If |initialized()| is false after construction, |on_initialized| will be
   // called when it becomes true.
   PersistentPrefStoreImpl(
       scoped_refptr<PersistentPrefStore> backing_pref_store,
       base::OnceClosure on_initialized);
 
   ~PersistentPrefStoreImpl() override;
 
   mojom::PersistentPrefStoreConnectionPtr CreateConnection(
       ObservedPrefs observed_prefs);
 
   bool initialized() { return !initializing_; }
 
  private:
   class Connection;
+  class WritableConnection;
 
   void SetValues(std::vector<mojom::PrefUpdatePtr> updates);
 
   void CommitPendingWrite();
   void SchedulePendingLossyWrites();
   void ClearMutableValues();
 
   // PrefStore::Observer:
   void OnPrefValueChanged(const std::string& key) override;
   void OnInitializationCompleted(bool succeeded) override;
 
+  // prefs::mojom::PrefStore:
+  void AddObserver(const std::vector<std::string>& prefs_to_observe,
+                   const AddObserverCallback& callback) override;
+
   void OnConnectionError(Connection* connection);
 
   scoped_refptr<PersistentPrefStore> backing_pref_store_;
 
   bool initializing_ = false;
 
   std::unordered_map<Connection*, std::unique_ptr<Connection>> connections_;
 
   base::OnceClosure on_initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(PersistentPrefStoreImpl);
 };
 
 }  // namespace prefs
 
 #endif  // SERVICES_PREFERENCES_PERSISTENT_PREF_STORE_IMPL_H_