Treat NotifyVirtual events as mouse move events for blink.

ui/events/x/events_x_utils.cc

Index: ui/events/x/events_x_utils.cc
diff --git a/ui/events/x/events_x_utils.cc b/ui/events/x/events_x_utils.cc
index fa37616887cec9592fa12b42e0aecdb70c18de07..20ada929c1aadd3e30515542a685d95760414454 100644
--- a/ui/events/x/events_x_utils.cc
+++ b/ui/events/x/events_x_utils.cc
@@ -815,4 +815,8 @@ void ResetTimestampRolloverCountersForTesting(
   SetEventTickClockForTesting(std::move(tick_clock));
 }
 
+bool IsVirtualMouseLeaveEvent(const XEvent& xev) {
+  return xev.type == LeaveNotify && xev.xcrossing.detail == NotifyVirtual;
+}
+
 }  // namespace ui