mus: Changes SetDisplayRoot() to create actual display

services/ui/display/screen_manager_ozone_internal.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/display/screen_manager_ozone_internal.h"
 
 #include <string>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 152 matching lines @@
 
 void ScreenManagerOzoneInternal::RequestCloseDisplay(int64_t display_id) {
   if (!fake_display_controller_)
     return;
 
   // Tell the NDD to remove the display. ScreenManager will get an update
   // that the display configuration has changed and the display will be gone.
   fake_display_controller_->RemoveDisplay(display_id);
 }
 
+display::ScreenBase* ScreenManagerOzoneInternal::GetScreen() {
+  return screen_;
+}
+
 void ScreenManagerOzoneInternal::ToggleAddRemoveDisplay() {
   if (!fake_display_controller_)
     return;
   DVLOG(1) << "ToggleAddRemoveDisplay";
 
   int num_displays = display_manager_->GetNumDisplays();
   if (num_displays == 1) {
     const gfx::Size& pixel_size =
         display_manager_->GetDisplayInfo(display_manager_->GetDisplayAt(0).id())
             .bounds_in_native()
@@ skipping 181 matching lines @@
       std::move(request));
 }
 
 void ScreenManagerOzoneInternal::Create(
     const service_manager::Identity& remote_identity,
     mojom::TestDisplayControllerRequest request) {
   test_bindings_.AddBinding(this, std::move(request));
 }
 
 }  // namespace display