Let gesture carry microseconds timestamp

ui/base/gestures/gesture_sequence.cc

Index: ui/base/gestures/gesture_sequence.cc
diff --git a/ui/base/gestures/gesture_sequence.cc b/ui/base/gestures/gesture_sequence.cc
index 2423c1b855b7716292216594d95e22211c64c2c7..34e8f636adf95f84437c5ce784bd9dc4104eac57 100644
--- a/ui/base/gestures/gesture_sequence.cc
+++ b/ui/base/gestures/gesture_sequence.cc
@@ -646,9 +646,11 @@ GestureEvent* GestureSequence::CreateGestureEvent(
   GestureEventDetails gesture_details(details);
   gesture_details.set_touch_points(point_count_);
   gesture_details.set_bounding_box(bounding_box_);
+  base::TimeDelta time_stamp =
+      base::TimeDelta::FromMicroseconds(timestamp.ToDoubleT() * 1000000);
   return new GestureEvent(gesture_details.type(), location.x(), location.y(),
-      flags, base::TimeDelta::FromMilliseconds(timestamp.ToDoubleT() * 1000),
-      gesture_details, touch_id_bitmask);
+                          flags, time_stamp, gesture_details,
+                          touch_id_bitmask);
 }
 
 void GestureSequence::AppendTapDownGestureEvent(const GesturePoint& point,