Added switch that let us 'un-stub' certain dbus clients.

chromeos/dbus/dbus_thread_manager.h

Index: chromeos/dbus/dbus_thread_manager.h
diff --git a/chromeos/dbus/dbus_thread_manager.h b/chromeos/dbus/dbus_thread_manager.h
index f225a5e14ca74b3c1ad78b3df97b688de0865bbd..7288a6b70de4893a2f01da0f7073f344023f6150 100644
--- a/chromeos/dbus/dbus_thread_manager.h
+++ b/chromeos/dbus/dbus_thread_manager.h
@@ -106,6 +106,10 @@ class CHROMEOS_EXPORT DBusThreadManager {
   // fake Shill devices and services, customizable with switches::kShillStub.
   static void InitializeWithStub();
 
+  // Initialize with stub implementations for only certain clients that are
+  // not included in comma-separated |unstub_clients| list.
+  static void InitializeWithPartialStub(const std::string& unstub_clients);
+
   // Returns true if DBusThreadManager has been initialized. Call this to
   // avoid initializing + shutting down DBusThreadManager more than once.
   static bool IsInitialized();