Keep dedicated layers for hiding animation

ui/views/corewm/focus_controller.cc

Index: ui/views/corewm/focus_controller.cc
diff --git a/ui/views/corewm/focus_controller.cc b/ui/views/corewm/focus_controller.cc
index a3107a19b4be27e51a4b550257f06786c327f4be..35b11705d509b4b755c021d1a3444e1665751bb8 100644
--- a/ui/views/corewm/focus_controller.cc
+++ b/ui/views/corewm/focus_controller.cc
@@ -13,6 +13,7 @@
 #include "ui/aura/window_tracker.h"
 #include "ui/events/event.h"
 #include "ui/views/corewm/focus_rules.h"
+#include "ui/views/corewm/window_animations.h"
 #include "ui/views/corewm/window_util.h"
 
 namespace views {
@@ -46,8 +47,11 @@ void StackWindowLayerAbove(aura::Window* window, aura::Window* relative_to) {
       relative_to = transient;
   }
   if (window != relative_to) {
-    window->layer()->parent()->StackAbove(window->layer(),
-                                          relative_to->layer());
+    ui::Layer* hiding_layer = DetachHidingAnimationLayer(window);
+    if (hiding_layer) {
+      window->layer()->parent()->StackAbove(hiding_layer,
+                                            relative_to->layer());
+    }
   }
 }