chromeos: Move files in //ash/common to //ash

ash/common/wm/screen_dimmer.h

-// Copyright (c) 2012 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_WM_SCREEN_DIMMER_H_
-#define ASH_COMMON_WM_SCREEN_DIMMER_H_
-
-#include <memory>
-#include <vector>
-
-#include "ash/ash_export.h"
-#include "ash/common/shell_observer.h"
-#include "base/macros.h"
-
-namespace ash {
-namespace test {
-class ScreenDimmerTest;
-}
-
-class WindowDimmer;
-
-template <typename UserData>
-class WmWindowUserData;
-
-// ScreenDimmer displays a partially-opaque layer above everything
-// else in the given container window to darken the display.  It shouldn't be
-// used for long-term brightness adjustments due to performance
-// considerations -- it's only intended for cases where we want to
-// briefly dim the screen (e.g. to indicate to the user that we're
-// about to suspend a machine that lacks an internal backlight that
-// can be adjusted).
-class ASH_EXPORT ScreenDimmer : public ShellObserver {
- public:
-  // Indicates the container ScreenDimmer operates on.
-  enum class Container {
-    ROOT,
-    LOCK_SCREEN,
-  };
-
-  explicit ScreenDimmer(Container container);
-  ~ScreenDimmer() override;
-
-  // Dim or undim the layers.
-  void SetDimming(bool should_dim);
-
-  void set_at_bottom(bool at_bottom) { at_bottom_ = at_bottom; }
-
-  bool is_dimming() const { return is_dimming_; }
-
-  // Find a ScreenDimmer in the container, or nullptr if it does not exist.
-  static ScreenDimmer* FindForTest(int container_id);
-
- private:
-  friend class test::ScreenDimmerTest;
-
-  // Returns the WmWindows (one per display) that correspond to |container_|.
-  std::vector<WmWindow*> GetAllContainers();
-
-  // ShellObserver:
-  void OnRootWindowAdded(WmWindow* root_window) override;
-
-  // Update the dimming state. This will also create a new DimWindow
-  // if necessary. (Used when a new display is connected)
-  void Update(bool should_dim);
-
-  const Container container_;
-
-  // Are we currently dimming the screen?
-  bool is_dimming_;
-  bool at_bottom_;
-
-  // Owns the WindowDimmers.
-  std::unique_ptr<WmWindowUserData<WindowDimmer>> window_dimmers_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScreenDimmer);
-};
-
-}  // namespace ash
-
-#endif  // ASH_COMMON_WM_SCREEN_DIMMER_H_