Keep the SystemModalContainerEventHandler added

components/exo/pointer.cc

Index: components/exo/pointer.cc
diff --git a/components/exo/pointer.cc b/components/exo/pointer.cc
index 5640ae93c59f81a7630688fa04c4b1cd93872a17..1e0fa05370942e38510926a7f2fafbbde59b1144 100644
--- a/components/exo/pointer.cc
+++ b/components/exo/pointer.cc
@@ -125,6 +125,12 @@ void Pointer::SetCursor(Surface* surface, const gfx::Point& hotspot) {
 void Pointer::OnMouseEvent(ui::MouseEvent* event) {
   Surface* target = GetEffectiveTargetForEvent(event);
 
+  if (!ash::Shell::GetInstance()->CanWindowReceiveEvents(
+          static_cast<aura::Window*>(event->target()))) {
+    event->StopPropagation();
+    return;
+  }
+
   // If target is different than the current pointer focus then we need to
   // generate enter and leave events.
   if (target != focus_) {