ash: Use floating point precision for laser pointer.

ash/laser/laser_pointer_controller.h

Index: ash/laser/laser_pointer_controller.h
diff --git a/ash/laser/laser_pointer_controller.h b/ash/laser/laser_pointer_controller.h
index 8ccd0f40c7cd825eb3ecc7a9b8b8f223998efc0b..57ae3cc0e1bca7c354e6fa4b6a0f71356ebb7f2a 100644
--- a/ash/laser/laser_pointer_controller.h
+++ b/ash/laser/laser_pointer_controller.h
@@ -11,7 +11,7 @@
 #include "base/macros.h"
 #include "ui/aura/window_observer.h"
 #include "ui/events/event_handler.h"
-#include "ui/gfx/geometry/point.h"
+#include "ui/gfx/geometry/point_f.h"
 
 namespace base {
 class Timer;
@@ -53,7 +53,7 @@ class ASH_EXPORT LaserPointerController : public ui::EventHandler,
   // needed. Also adds the latest point at |event_location| and stops
   // propagation of |event|.
   void UpdateLaserPointerView(aura::Window* current_window,
-                              const gfx::Point& event_location,
+                              const gfx::PointF& event_location,
                               ui::Event* event);
 
   // Destroys |laser_pointer_view_|, if it exists.
@@ -75,7 +75,7 @@ class ASH_EXPORT LaserPointerController : public ui::EventHandler,
   bool is_fading_away_ = false;
 
   // The last seen stylus location in screen coordinates.
-  gfx::Point current_stylus_location_;
+  gfx::PointF current_stylus_location_;
 
   // |laser_pointer_view_| will only hold an instance when the laser pointer is
   // enabled and activated (pressed or dragged).