WIP: Pref service user prefs.

components/sync_preferences/pref_service_syncable_factory.cc

Index: components/sync_preferences/pref_service_syncable_factory.cc
diff --git a/components/sync_preferences/pref_service_syncable_factory.cc b/components/sync_preferences/pref_service_syncable_factory.cc
index 95a1a3441d79d432068a60222fd210c8e7227cb8..3f85e100749532eb101bcb8219bb92d894ca56fc 100644
--- a/components/sync_preferences/pref_service_syncable_factory.cc
+++ b/components/sync_preferences/pref_service_syncable_factory.cc
@@ -11,6 +11,7 @@
 #include "components/prefs/pref_notifier_impl.h"
 #include "components/prefs/pref_value_store.h"
 #include "components/sync_preferences/pref_service_syncable.h"
+#include "services/preferences/public/cpp/persistent_pref_store_client.h"
 #include "services/preferences/public/cpp/pref_store_adapter.h"
 #include "services/preferences/public/interfaces/preferences.mojom.h"
 #include "services/service_manager/public/cpp/connector.h"
@@ -81,6 +82,13 @@ std::unique_ptr<PrefServiceSyncable> PrefServiceSyncableFactory::CreateSyncable(
     user_prefs::PrefRegistrySyncable* pref_registry,
     service_manager::Connector* connector) {
   TRACE_EVENT0("browser", "PrefServiceSyncableFactory::CreateSyncable");
+  if (!user_prefs_) {
+    prefs::mojom::PersistentPrefStoreConnectorPtr pref_connector;
+    connector->BindInterface(prefs::mojom::kPrefStoreServiceName,
+                             &pref_connector);
+    user_prefs_ =
+        new prefs::PersistentPrefStoreClient(std::move(pref_connector));
+  }
   PrefNotifierImpl* pref_notifier = new PrefNotifierImpl();
 
   // Expose all read-only stores through the prefs service.