Introduce window container to be used by lock screen app windows

ash/tray_action/tray_action.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/tray_action/tray_action.h"
 
 #include <utility>
 
 #include "ash/tray_action/tray_action_observer.h"
 #include "base/bind.h"
@@ skipping 11 matching lines @@
 }
 
 void TrayAction::RemoveObserver(TrayActionObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 void TrayAction::BindRequest(mojom::TrayActionRequest request) {
   bindings_.AddBinding(this, std::move(request));
 }
 
-mojom::TrayActionState TrayAction::GetLockScreenNoteState() {
+mojom::TrayActionState TrayAction::GetLockScreenNoteState() const {
   if (!tray_action_client_)
     return mojom::TrayActionState::kNotAvailable;
   return lock_screen_note_state_;
 }
 
+bool TrayAction::IsLockScreenNoteActive() const {
+  return GetLockScreenNoteState() == mojom::TrayActionState::kActive;
+}
+
 void TrayAction::SetClient(mojom::TrayActionClientPtr tray_action_client,
                            mojom::TrayActionState lock_screen_note_state) {
   mojom::TrayActionState old_lock_screen_note_state = GetLockScreenNoteState();
 
   tray_action_client_ = std::move(tray_action_client);
 
   if (tray_action_client_) {
     // Makes sure the state is updated in case the connection is lost.
     tray_action_client_.set_connection_error_handler(
         base::Bind(&TrayAction::SetClient, base::Unretained(this), nullptr,
@@ skipping 27 matching lines @@
   DCHECK(tray_action_client_);
   tray_action_client_->RequestNewLockScreenNote();
 }
 
 void TrayAction::NotifyLockScreenNoteStateChanged() {
   for (auto& observer : observers_)
     observer.OnLockScreenNoteStateChanged(GetLockScreenNoteState());
 }
 
 }  // namespace ash