Change ui::Event::time_stamp from TimeDelta to TimeTicks

ash/wm/system_gesture_event_filter_unittest.cc

Index: ash/wm/system_gesture_event_filter_unittest.cc
diff --git a/ash/wm/system_gesture_event_filter_unittest.cc b/ash/wm/system_gesture_event_filter_unittest.cc
index d5f90bb5c06debc031d4775e3cd04f07ca1cd3a0..56199bffd0c9f62fe786c2ddcd7a748ac462781a 100644
--- a/ash/wm/system_gesture_event_filter_unittest.cc
+++ b/ash/wm/system_gesture_event_filter_unittest.cc
@@ -144,9 +144,8 @@ ui::GestureEvent* CreateGesture(ui::EventType type,
                                 int touch_id) {
   ui::GestureEventDetails details =
       ui::GestureEventDetails(type, delta_x, delta_y);
-  return new ui::GestureEvent(x, y, 0,
-      base::TimeDelta::FromMilliseconds(base::Time::Now().ToDoubleT() * 1000),
-      ui::GestureEventDetails(type, delta_x, delta_y));
+  return new ui::GestureEvent(x, y, 0, base::TimeTicks::Now(),
+                              ui::GestureEventDetails(type, delta_x, delta_y));
 }
 
 TEST_F(SystemGestureEventFilterTest, TwoFingerDrag) {