FocusController needs to restack windows upon activation (but not focus).

ui/views/corewm/focus_controller_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/corewm/focus_controller.h"
 
 #include <map>
 
 #include "ui/aura/client/activation_client.h"
 #include "ui/aura/root_window.h"
@@ skipping 249 matching lines @@
     FocusWindowById(2);
     EXPECT_EQ(2, focused_window_id());
   }
   virtual void BasicActivation() OVERRIDE {
     EXPECT_EQ(NULL, GetActiveWindow());
     ActivateWindowById(1);
     EXPECT_EQ(1, GetActiveWindowId());
     ActivateWindowById(2);
     EXPECT_EQ(2, GetActiveWindowId());
     DeactivateWindow(GetActiveWindow());
-    EXPECT_EQ(3, GetActiveWindowId());
+    EXPECT_EQ(1, GetActiveWindowId());
   }
   virtual void FocusEvents() OVERRIDE {
     FocusEventsTestHandler handler(root_window()->GetChildById(1));
     EXPECT_EQ(0, handler.GetCountForEventType(
         FocusChangeEvent::focus_changing_event_type()));
     EXPECT_EQ(0, handler.GetCountForEventType(
         FocusChangeEvent::focus_changed_event_type()));
     FocusWindowById(1);
     EXPECT_EQ(1, handler.GetCountForEventType(
         FocusChangeEvent::focus_changing_event_type()));
@@ skipping 444 matching lines @@
 DIRECT_FOCUS_CHANGE_TESTS(ShiftFocusToChildOfInactiveWindow);
 
 // - Verifies that FocusRules determine what can be focused.
 ALL_FOCUS_TESTS(FocusRulesOverride);
 
 // - Verifies that FocusRules determine what can be activated.
 TARGET_FOCUS_TESTS(ActivationRulesOverride);
 
 }  // namespace corewm
 }  // namespace views