Makes it possible for clients to directly create WindowTreeHostMus

ui/aura/test/aura_test_helper.cc

 // 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.
 
 #include "ui/aura/test/aura_test_helper.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "ui/aura/client/default_capture_client.h"
@@ skipping 152 matching lines @@
 Env::WindowPortFactory AuraTestHelper::InitMus() {
   window_tree_client_setup_ = base::MakeUnique<TestWindowTreeClientSetup>();
   window_tree_client_setup_->InitForWindowManager(window_tree_delegate_,
                                                   window_manager_delegate_);
   return base::Bind(&AuraTestHelper::CreateWindowPortMus,
                     base::Unretained(this));
 }
 
 std::unique_ptr<WindowPort> AuraTestHelper::CreateWindowPortMus(
     Window* window) {
-  return base::MakeUnique<WindowPortMus>(window_tree_client());
+  return base::MakeUnique<WindowPortMus>(window_tree_client(),
+                                         WindowMusType::LOCAL);
 }
 
 }  // namespace test
 }  // namespace aura