Enable software compositing while Night Light is on

ash/system/night_light/night_light_controller.cc

 // Copyright 2017 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 "ash/system/night_light/night_light_controller.h"
 
 #include "ash/public/cpp/ash_pref_names.h"
 #include "ash/session/session_controller.h"
 #include "ash/shell.h"
 #include "base/time/time.h"
@@ skipping 97 matching lines @@
   active_user_pref_service_ = Shell::Get()->GetActiveUserPrefService();
   InitFromUserPrefs();
 }
 
 void NightLightController::Refresh() {
   // TODO(afakhry): Add here refreshing of start and end times, when you
   // implement the automatic schedule settings.
   ApplyColorTemperatureToLayers(
       GetEnabled() ? GetColorTemperature() : 0.0f,
       base::TimeDelta::FromSeconds(kManualToggleAnimationDurationSec));
+  Shell::Get()->SetCursorCompositingEnabled(GetEnabled());
 }
 
 void NightLightController::StartWatchingPrefsChanges() {
   DCHECK(active_user_pref_service_);
 
   pref_change_registrar_ = base::MakeUnique<PrefChangeRegistrar>();
   pref_change_registrar_->Init(active_user_pref_service_);
   pref_change_registrar_->Add(
       prefs::kNightLightEnabled,
       base::Bind(&NightLightController::OnEnabledPrefChanged,
@@ skipping 25 matching lines @@
   Refresh();
   NotifyStatusChanged();
 }
 
 void NightLightController::OnColorTemperaturePrefChanged() {
   DCHECK(active_user_pref_service_);
   Refresh();
 }
 
 }  // namespace ash