chromeos: Move files in //ash/common to //ash, part 1

ash/common/system/toast/toast_manager.h

-// 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.
-
-#ifndef ASH_COMMON_SYSTEM_TOAST_TOAST_MANAGER_H_
-#define ASH_COMMON_SYSTEM_TOAST_TOAST_MANAGER_H_
-
-#include <deque>
-#include <memory>
-#include <string>
-
-#include "ash/ash_export.h"
-#include "ash/common/system/toast/toast_data.h"
-#include "ash/common/system/toast/toast_overlay.h"
-#include "base/memory/weak_ptr.h"
-
-namespace ash {
-
-// Class managing toast requests.
-class ASH_EXPORT ToastManager : public ToastOverlay::Delegate {
- public:
-  ToastManager();
-  ~ToastManager() override;
-
-  // Show a toast. If there are queued toasts, succeeding toasts are queued as
-  // well, and are shown one by one.
-  void Show(const ToastData& data);
-
-  void Cancel(const std::string& id);
-
-  // ToastOverlay::Delegate overrides:
-  void OnClosed() override;
-
- private:
-  friend class ToastManagerTest;
-
-  void ShowLatest();
-  void OnDurationPassed(int toast_number);
-
-  ToastOverlay* GetCurrentOverlayForTesting() { return overlay_.get(); }
-  int serial_for_testing() const { return serial_; }
-  void ResetSerialForTesting() { serial_ = 0; }
-
-  // ID of the toast which is currently shown. Empty if no toast is visible.
-  std::string current_toast_id_;
-
-  int serial_ = 0;
-  std::deque<ToastData> queue_;
-  std::unique_ptr<ToastOverlay> overlay_;
-
-  base::WeakPtrFactory<ToastManager> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(ToastManager);
-};
-
-}  // namespace ash
-
-#endif  // ASH_COMMON_SYSTEM_TOAST_TOAST_MANAGER_H_