ash: Add basic prediction code to the laser pointer.

ash/laser/laser_pointer_controller_test_api.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_LASER_LASER_POINTER_CONTROLLER_TEST_API_H_
 #define ASH_LASER_LASER_POINTER_CONTROLLER_TEST_API_H_
 
 #include "base/macros.h"
 
 namespace ash {
 
 class LaserPointerController;
 class LaserPointerPoints;
 class LaserPointerView;
 
 // An api for testing the LaserPointerController class.
 class LaserPointerControllerTestApi {
  public:
   explicit LaserPointerControllerTestApi(LaserPointerController* instance);
   ~LaserPointerControllerTestApi();
 
   void SetEnabled(bool enabled);
-  bool IsShowingLaserPointer();
-  bool IsFadingAway();
+  bool IsShowingLaserPointer() const;
+  bool IsFadingAway() const;
   void SetIsFadingAway(bool fading_away);
-  const LaserPointerPoints& laser_points();
-  LaserPointerView* laser_pointer_view();
+  const LaserPointerPoints& laser_points() const;
+  const LaserPointerPoints& predicted_laser_points() const;
+  LaserPointerView* laser_pointer_view() const;
 
  private:
   LaserPointerController* instance_;
 
   DISALLOW_COPY_AND_ASSIGN(LaserPointerControllerTestApi);
 };
 
 }  // namespace ash
 
 #endif  // ASH_LASER_LASER_POINTER_CONTROLLER_TEST_API_H_