dbus: adding PostTaskToDBusThreadAndReply

dbus/bus.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_BUS_H_
 #define DBUS_BUS_H_
 
 #include <dbus/dbus.h>
 
 #include <map>
@@ skipping 493 matching lines @@
   virtual bool TryRegisterObjectPath(const ObjectPath& object_path,
                                      const DBusObjectPathVTable* vtable,
                                      void* user_data,
                                      DBusError* error);
 
   // Unregister the object path.
   //
   // BLOCKING CALL.
   virtual void UnregisterObjectPath(const ObjectPath& object_path);
 
+  // Posts |task| to the task runner of the D-Bus thread. On completion, |reply|
+  // is posted to the origin thread.
+  virtual void PostTaskToDBusThreadAndReply(
+      const tracked_objects::Location& from_here,
+      const base::Closure& task,
+      const base::Closure& reply);
+
   // Posts the task to the task runner of the thread that created the bus.
   virtual void PostTaskToOriginThread(
       const tracked_objects::Location& from_here,
       const base::Closure& task);
 
   // Posts the task to the task runner of the D-Bus thread. If D-Bus
   // thread is not supplied, the task runner of the origin thread will be
   // used.
   virtual void PostTaskToDBusThread(
       const tracked_objects::Location& from_here,
@@ skipping 163 matching lines @@
 
   std::string address_;
   base::Closure on_disconnected_closure_;
 
   DISALLOW_COPY_AND_ASSIGN(Bus);
 };
 
 }  // namespace dbus
 
 #endif  // DBUS_BUS_H_