ash: Add basic prediction code to the 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 57ae3cc0e1bca7c354e6fa4b6a0f71356ebb7f2a..c23b8009da619dcc6a555d638dc77172b77d8a6f 100644
--- a/ash/laser/laser_pointer_controller.h
+++ b/ash/laser/laser_pointer_controller.h
@@ -9,6 +9,7 @@
 
 #include "ash/ash_export.h"
 #include "base/macros.h"
+#include "base/time/time.h"
 #include "ui/aura/window_observer.h"
 #include "ui/events/event_handler.h"
 #include "ui/gfx/geometry/point_f.h"
@@ -66,6 +67,9 @@ class ASH_EXPORT LaserPointerController : public ui::EventHandler,
   std::unique_ptr<base::Timer> stationary_timer_;
   int stationary_timer_repeat_count_ = 0;
 
+  // The presentation delay used for prediction by the laser pointer view.
+  base::TimeDelta presentation_delay_;
+
   bool enabled_ = false;
 
   // |is_fading_away_| determines whether the laser pointer view should accept