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..4a0d1bed439667596889b4293feb5bd7da001c43 100644
--- a/chromeos/dbus/dbus_thread_manager.h
+++ b/chromeos/dbus/dbus_thread_manager.h
@@ -101,10 +101,18 @@ class CHROMEOS_EXPORT DBusThreadManager {
   // Shutdown(). Does not create any Fake client implementations.
   static void InitializeForTesting(DBusThreadManager* dbus_thread_manager);
 
+  // Initialize global thread manager instance.
+  static void InitializeThreadManager();
+
   // Initialize with stub implementations for tests, creating a complete set
   // of fake/stub client implementations. Also initializes a default set of
   // fake Shill devices and services, customizable with switches::kShillStub.
-  static void InitializeWithStub();
+  static void InitializeThreadManagerWithStub();
+
+  // Initialize with stub implementations for only certain clients that are
+  // not included in comma-separated |unstub_clients| list.
+  static void InitializeThreadManagerWithPartialStub(
+      const std::string& unstub_clients);
 
   // Returns true if DBusThreadManager has been initialized. Call this to
   // avoid initializing + shutting down DBusThreadManager more than once.