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

ash/common/system/tiles/tiles_default_view.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_TILES_TILES_DEFAULT_VIEW_H_
-#define ASH_COMMON_SYSTEM_TILES_TILES_DEFAULT_VIEW_H_
-
-#include "ash/ash_export.h"
-#include "ash/common/login_status.h"
-#include "base/macros.h"
-#include "ui/views/controls/button/button.h"
-#include "ui/views/view.h"
-
-namespace views {
-class CustomButton;
-}
-
-namespace ash {
-class SystemTrayItem;
-
-// The container view for the tiles in the bottom row of the system menu
-// (settings, help, lock, and power).
-class ASH_EXPORT TilesDefaultView : public views::View,
-                                    public views::ButtonListener {
- public:
-  TilesDefaultView(SystemTrayItem* owner, LoginStatus login);
-  ~TilesDefaultView() override;
-
-  // Sets the layout manager and child views of |this|.
-  // TODO(tdanderson|bruthig): Consider moving the layout manager
-  // setup code to a location which can be shared by other system menu rows.
-  void Init();
-
-  // views::ButtonListener:
-  void ButtonPressed(views::Button* sender, const ui::Event& event) override;
-
-  // Accessor needed to obtain the help button view for the first-run flow.
-  views::View* GetHelpButtonView() const;
-
-  const views::CustomButton* GetShutdownButtonViewForTest() const;
-
- private:
-  friend class TrayTilesTest;
-
-  SystemTrayItem* owner_;
-  LoginStatus login_;
-
-  // Pointers to the child buttons of |this|. Note that some buttons may not
-  // exist (depending on the user's current login status, for instance), in
-  // which case the corresponding pointer will be null.
-  views::CustomButton* settings_button_;
-  views::CustomButton* help_button_;
-  views::CustomButton* lock_button_;
-  views::CustomButton* power_button_;
-
-  DISALLOW_COPY_AND_ASSIGN(TilesDefaultView);
-};
-
-}  // namespace ash
-
-#endif  // ASH_COMMON_SYSTEM_TILES_TILES_DEFAULT_VIEW_H_