Short term workaround to deal with calculation error caused by inverted matrix.

ui/aura/test/event_generator.cc

Index: ui/aura/test/event_generator.cc
diff --git a/ui/aura/test/event_generator.cc b/ui/aura/test/event_generator.cc
index 82735fc36509bc93155564180fccfb3130ced3ce..2285e425344c098b20d8366f1281db8fdff64ed5 100644
--- a/ui/aura/test/event_generator.cc
+++ b/ui/aura/test/event_generator.cc
@@ -156,6 +156,7 @@ void EventGenerator::MoveMouseTo(const gfx::Point& point, int count) {
       UpdateCurrentRootWindow(move_point);
     ConvertPointToTarget(current_root_window_, &move_point);
     ui::MouseEvent mouseev(event_type, move_point, move_point, flags_);
+    mouseev.set_system_location(move_point);
     Dispatch(&mouseev);
   }
   current_location_ = point;