ash: Refactor autoclick common code to ash/autoclick/common.

ash/autoclick/common/autoclick_ring_handler.h

-// Copyright (c) 2016 The Chromium Authors. All rights reserved.
+// 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 CHROME_BROWSER_CHROMEOS_UI_AUTOCLICK_RING_HANDLER_H_
-#define CHROME_BROWSER_CHROMEOS_UI_AUTOCLICK_RING_HANDLER_H_
+#ifndef ASH_AUTOCLICK_COMMON_AUTOCLICK_RING_HANDLER_H_
+#define ASH_AUTOCLICK_COMMON_AUTOCLICK_RING_HANDLER_H_
 
-#include <memory>
-
-#include "ash/autoclick/autoclick_controller.h"
 #include "base/macros.h"
 #include "base/timer/timer.h"
-#include "ui/aura/window_observer.h"
-#include "ui/events/event.h"
 #include "ui/gfx/animation/linear_animation.h"
 #include "ui/gfx/geometry/point.h"
 
-namespace chromeos {
+namespace views {
+class Widget;
+}
+
+namespace ash {
 
 // AutoclickRingHandler displays an animated affordance that is shown
 // on autoclick gesture. The animation sequence consists of two circles which
 // shrink towards the spot the autoclick will generate a mouse event.
-class AutoclickRingHandler : public gfx::LinearAnimation,
-                             public aura::WindowObserver,
-                             public ash::AutoclickController::Delegate {
+class AutoclickRingHandler : public gfx::LinearAnimation {
  public:
   AutoclickRingHandler();
   ~AutoclickRingHandler() override;
 
+  void StartGesture(base::TimeDelta duration,
+                    const gfx::Point& center_point_in_screen,
+                    views::Widget* widget);
+  void StopGesture();
+  void SetGestureCenter(const gfx::Point& center_point_in_screen,
+                        views::Widget* widget);
+
  private:
-  // Overriden from ash::AutoclickController::Delegate.
-  void StartGesture(base::TimeDelta duration,
-                    const gfx::Point& center_point_in_screen) override;
-  void StopGesture() override;
-  void SetGestureCenter(const gfx::Point& center_point_in_screen) override;
-
   class AutoclickRingView;
 
   enum class AnimationType {
     NONE,
     GROW_ANIMATION,
     SHRINK_ANIMATION,
   };
 
-  aura::Window* GetTargetWindow();
-  void SetTapDownTarget();
   void StartAnimation(base::TimeDelta duration);
   void StopAutoclickRing();
-  void SetTapDownTarget(aura::Window* target);
 
   // Overridden from gfx::LinearAnimation.
   void AnimateToState(double state) override;
   void AnimationStopped() override;
 
-  // Overridden from aura::WindowObserver.
-  void OnWindowDestroying(aura::Window* window) override;
-
   std::unique_ptr<AutoclickRingView> view_;
+  views::Widget* ring_widget_;
   // Location of the simulated mouse event from auto click in screen
   // coordinates.
   gfx::Point tap_down_location_;
-  // The target window is observed by AutoclickRingHandler for the duration of
-  // a autoclick gesture.
-  aura::Window* tap_down_target_;
   AnimationType current_animation_type_;
   base::TimeDelta animation_duration_;
 
   DISALLOW_COPY_AND_ASSIGN(AutoclickRingHandler);
 };
 
-}  // namespace chromeos
+}  // namespace ash
 
-#endif  // CHROME_BROWSER_CHROMEOS_UI_AUTOCLICK_RING_HANDLER_H_
+#endif  // ASH_AUTOCLICK_COMMON_AUTOCLICK_RING_HANDLER_H_