Laser tool blocks events from propagating.

ash/common/system/chromeos/palette/tools/laser_pointer_mode.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_CHROMEOS_PALETTE_TOOLS_LASER_POINTER_MODE_H_
 #define ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_TOOLS_LASER_POINTER_MODE_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/system/chromeos/palette/common_palette_tool.h"
-#include "ui/gfx/geometry/point.h"
-#include "ui/views/pointer_watcher.h"
 
 namespace base {
 class Timer;
 }
 
 namespace ash {
 
-class LaserPointerView;
-
-// Controller for the laser pointer functionality. Enables/disables laser
-// pointer as well as receives points and passes them off to be rendered.
-class ASH_EXPORT LaserPointerMode : public CommonPaletteTool,
-                                    public views::PointerWatcher {
+// Controller for the laser pointer functionality.
+class ASH_EXPORT LaserPointerMode : public CommonPaletteTool {
  public:
   explicit LaserPointerMode(Delegate* delegate);
   ~LaserPointerMode() override;
 
  private:
-  friend class LaserPointerModeTestApi;
-
   // PaletteTool:
   PaletteGroup GetGroup() const override;
   PaletteToolId GetToolId() const override;
   void OnEnable() override;
   void OnDisable() override;
   const gfx::VectorIcon& GetActiveTrayIcon() const override;
   views::View* CreateView() override;
 
   // CommonPaletteTool:
   const gfx::VectorIcon& GetPaletteIcon() const override;
 
-  // views::PointerWatcher:
-  void OnPointerEventObserved(const ui::PointerEvent& event,
-                              const gfx::Point& location_in_screen,
-                              views::Widget* target) override;
-
-  void StopTimer();
-
-  // Timer callback which adds a point where the mouse was last seen. This
-  // allows the trail to fade away when the mouse is stationary.
-  void AddStationaryPoint();
-
-  // Timer which will add a new stationary point when the mouse stops moving.
-  // This will remove points that are too old.
-  std::unique_ptr<base::Timer> timer_;
-  int timer_repeat_count_ = 0;
-
-  gfx::Point current_mouse_location_;
-  std::unique_ptr<LaserPointerView> laser_pointer_view_;
-
   DISALLOW_COPY_AND_ASSIGN(LaserPointerMode);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_TOOLS_LASER_POINTER_MODE_H_