dbus: Add comments about the right way to expose methods

dbus/test_service.h

 // Copyright (c) 2012 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 DBUS_TEST_SERVICE_H_
 #define DBUS_TEST_SERVICE_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread.h"
@@ skipping 152 matching lines @@
   // Helper function for SendPropertyChangedSignal().
   void SendPropertyChangedSignalInternal(const std::string& name);
 
   // Helper function for RequestOwnership().
   void RequestOwnershipInternal(base::Callback<void(bool)> callback);
 
   // Options to use when requesting service ownership.
   Bus::ServiceOwnershipOptions request_ownership_options_;
 
   scoped_refptr<base::SequencedTaskRunner> dbus_task_runner_;
-  base::WaitableEvent on_all_methods_exported_;
+  base::WaitableEvent on_name_obtained_;
   // The number of methods actually exported.
   int num_exported_methods_;
 
   // True iff this instance has successfully acquired the name ownership.
   bool has_ownership_;
 
   scoped_refptr<Bus> bus_;
   ExportedObject* exported_object_;
   ExportedObject* exported_object_manager_;
 };
 
 }  // namespace dbus
 
 #endif  // DBUS_TEST_SERVICE_H_