mus: Changes SetDisplayRoot() to create actual display

services/ui/display/screen_manager_stub_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_stub_internal.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "services/service_manager/public/cpp/binder_registry.h"
 #include "services/ui/display/viewport_metrics.h"
+#include "ui/display/screen/screen_base.h"
 #include "ui/gfx/geometry/dip_util.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace display {
 namespace {
 
 constexpr gfx::Size kDisplayPixelSize(1024, 768);
 
 // Build a 1024x768 pixel display.
@@ skipping 14 matching lines @@
 }
 
 }  // namespace
 
 // static
 std::unique_ptr<ScreenManager> ScreenManager::Create() {
   return base::MakeUnique<ScreenManagerStubInternal>();
 }
 
 ScreenManagerStubInternal::ScreenManagerStubInternal()
-    : weak_ptr_factory_(this) {}
+    : screen_(base::MakeUnique<display::ScreenBase>()),
+      weak_ptr_factory_(this) {}
 
 ScreenManagerStubInternal::~ScreenManagerStubInternal() {}
 
 void ScreenManagerStubInternal::FixedSizeScreenConfiguration() {
   ViewportMetrics metrics;
   metrics.bounds_in_pixels = gfx::Rect(kDisplayPixelSize);
   metrics.device_scale_factor = display_.device_scale_factor();
   metrics.ui_scale_factor = 1.f;
 
   delegate_->OnDisplayAdded(display_, metrics);
@@ skipping 13 matching lines @@
 }
 
 void ScreenManagerStubInternal::RequestCloseDisplay(int64_t display_id) {
   if (display_id == display_.id()) {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE, base::Bind(&ScreenManagerDelegate::OnDisplayRemoved,
                               base::Unretained(delegate_), display_id));
   }
 }
 
+display::ScreenBase* ScreenManagerStubInternal::GetScreen() {
+  return screen_.get();
+}
+
 }  // namespace display