Add PlatformScreenDelegate and start implementation.

services/ui/ws/test_utils.cc

 // 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.
 
 #include "services/ui/ws/test_utils.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "cc/output/copy_output_request.h"
@@ skipping 408 matching lines @@
 
 WindowEventTargetingHelper::WindowEventTargetingHelper()
     : wm_client_(nullptr),
       cursor_id_(0),
       platform_display_factory_(&cursor_id_),
       display_binding_(nullptr),
       display_(nullptr),
       surfaces_state_(new SurfacesState()),
       window_server_(nullptr) {
   PlatformDisplay::set_factory_for_testing(&platform_display_factory_);
-  window_server_.reset(
-      new WindowServer(&window_server_delegate_, surfaces_state_));
+  window_server_.reset(new WindowServer(&window_server_delegate_));
   PlatformDisplayInitParams display_init_params;
   display_init_params.surfaces_state = surfaces_state_;
   display_ = new Display(window_server_.get(), display_init_params);
   display_binding_ = new TestDisplayBinding(window_server_.get());
   display_->Init(base::WrapUnique(display_binding_));
   wm_client_ = window_server_delegate_.last_client();
   wm_client_->tracker()->changes()->clear();
 }
 
 WindowEventTargetingHelper::~WindowEventTargetingHelper() {}
@@ skipping 101 matching lines @@
     return nullptr;
   if (!tree->AddWindow(parent_client_id, client_window_id))
     return nullptr;
   *client_id = client_window_id;
   return tree->GetWindowByClientId(client_window_id);
 }
 
 }  // namespace test
 }  // namespace ws
 }  // namespace ui