Pref service: add a factory to create the client lib

services/preferences/public/cpp/pref_store_manager_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_MANAGER_IMPL_H_
 #define SERVICES_PREFERENCES_PUBLIC_CPP_PREF_STORE_MANAGER_IMPL_H_
 
 #include <memory>
 #include <set>
 #include <unordered_map>
@@ skipping 79 matching lines @@
 
   // Have all the expected PrefStores connected?
   bool AllConnected() const;
 
   // PrefStores that need to register before replying to any Connect calls.
   PrefStoreTypes expected_pref_stores_;
 
   // Registered pref stores.
   PrefStorePtrs pref_store_ptrs_;
 
+  // We hold on to the connection request callbacks until all expected
+  // PrefStores have registered.
+  std::vector<ConnectCallback> pending_callbacks_;
+
   mojo::BindingSet<mojom::PrefStoreConnector> connector_bindings_;
   mojo::BindingSet<mojom::PrefStoreRegistry> registry_bindings_;
   std::unique_ptr<PersistentPrefStoreImpl> persistent_pref_store_;
   mojo::BindingSet<mojom::PersistentPrefStoreConnector>
       persistent_pref_store_bindings_;
   mojo::Binding<mojom::PrefServiceControl> init_binding_;
 
   // Requests made to connect to the service before it has been initialized.
   // These will be handled when initialization completes.
   std::vector<mojom::PersistentPrefStoreConnectorRequest>
       pending_persistent_pref_store_requests_;
 
   scoped_refptr<base::SequencedWorkerPool> worker_pool_;
 
-  // We hold on to the connection request callbacks until all expected
-  // PrefStores have registered.
-  std::vector<ConnectCallback> pending_callbacks_;
-
   DISALLOW_COPY_AND_ASSIGN(PrefStoreManagerImpl);
 };
 
 }  // namespace prefs
 
 #endif  // SERVICES_PREFERENCES_PUBLIC_CPP_PREF_STORE_MANAGER_IMPL_H_