chromeos: Move files in //ash/common to //ash, part 2

ash/common/wm/workspace/two_step_edge_cycler.h

-// Copyright 2014 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_WORKSPACE_TWO_STEP_EDGE_CYCLER_H_
-#define ASH_COMMON_WM_WORKSPACE_TWO_STEP_EDGE_CYCLER_H_
-
-#include "ash/ash_export.h"
-#include "base/macros.h"
-#include "base/time/time.h"
-#include "ui/gfx/geometry/point.h"
-
-namespace ash {
-
-// TwoStepEdgeCycler is responsible for cycling between two modes when the mouse
-// is at the edge of the workspace. The cycler does not loop so it is impossible
-// to get back to the first mode once the second mode is reached.
-// TwoStepEdgeCycler should be destroyed once the mouse moves off the edge of
-// the workspace.
-class ASH_EXPORT TwoStepEdgeCycler {
- public:
-  // The direction in which a mouse should travel to switch mode.
-  enum Direction { DIRECTION_LEFT, DIRECTION_RIGHT };
-
-  explicit TwoStepEdgeCycler(const gfx::Point& start, Direction direction);
-  ~TwoStepEdgeCycler();
-
-  // Update which mode should be used as a result of a mouse / touch move.
-  // |location| is the location of the event.
-  void OnMove(const gfx::Point& location);
-
-  bool use_second_mode() const { return second_mode_; }
-
- private:
-  // Whether the second mode should be used.
-  bool second_mode_;
-
-  // Time OnMove() was last invoked.
-  base::TimeTicks time_last_move_;
-
-  // The number of moves since the cycler was constructed.
-  int num_moves_;
-
-  // Initial x-coordinate.
-  int start_x_;
-
-  // x-coordinate when paused.
-  int paused_x_;
-
-  // Whether the movement was paused.
-  bool paused_;
-
-  // Determines a preferred movement direction that we are watching.
-  Direction direction_;
-
-  DISALLOW_COPY_AND_ASSIGN(TwoStepEdgeCycler);
-};
-
-}  // namespace ash
-
-#endif  // ASH_COMMON_WM_WORKSPACE_TWO_STEP_EDGE_CYCLER_H_