Implement a system-level entry cache so that packages loaded from the system dir can be visible to …

mojo/services/catalog/factory.cc

Index: mojo/services/catalog/factory.cc
diff --git a/mojo/services/catalog/factory.cc b/mojo/services/catalog/factory.cc
index 2b6229921b3e96d4e55b142eea4f0263b451075b..09b18064940a51a93cb6bd6b277f050fb13f494a 100644
--- a/mojo/services/catalog/factory.cc
+++ b/mojo/services/catalog/factory.cc
@@ -58,7 +58,8 @@ Catalog* Factory::GetCatalogForUserId(const std::string& user_id) {
     return it->second.get();
 
   // TODO(beng): There needs to be a way to load the store from different users.
-  Catalog* instance = new Catalog(std::move(store_), file_task_runner_);
+  Catalog* instance =
+      new Catalog(std::move(store_), file_task_runner_, &system_catalog_);
   catalogs_[user_id] = make_scoped_ptr(instance);
   return instance;
 }