Move PlatformDisplayDefault into it's own file.

services/ui/ws/test_utils.h

 // Copyright 2016 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 SERVICES_UI_WS_TEST_UTILS_H_
 #define SERVICES_UI_WS_TEST_UTILS_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "services/ui/public/interfaces/display_manager.mojom.h"
 #include "services/ui/public/interfaces/window_tree.mojom.h"
 #include "services/ui/ws/display.h"
 #include "services/ui/ws/display_binding.h"
 #include "services/ui/ws/drag_controller.h"
 #include "services/ui/ws/event_dispatcher.h"
+#include "services/ui/ws/frame_generator_delegate.h"
 #include "services/ui/ws/platform_display.h"
 #include "services/ui/ws/platform_display_factory.h"
 #include "services/ui/ws/test_change_tracker.h"
 #include "services/ui/ws/user_activity_monitor.h"
 #include "services/ui/ws/user_display_manager.h"
 #include "services/ui/ws/user_id.h"
 #include "services/ui/ws/window_manager_state.h"
 #include "services/ui/ws/window_manager_window_tree_factory_set.h"
 #include "services/ui/ws/window_server_delegate.h"
 #include "services/ui/ws/window_tree.h"
@@ skipping 612 matching lines @@
 ServerWindow* NewWindowInTree(WindowTree* tree, ClientWindowId* client_id);
 ServerWindow* NewWindowInTreeWithParent(WindowTree* tree,
                                         ServerWindow* parent,
                                         ClientWindowId* client_id);
 
 }  // namespace test
 }  // namespace ws
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_TEST_UTILS_H_