Adding Baseframework of the ResourceManager (all hooks and observers) are being put in place with a…

athena/wm/window_manager_impl.cc

 // Copyright 2014 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 "athena/wm/window_manager_impl.h"
 
 #include <algorithm>
 
 #include "athena/common/container_priorities.h"
 #include "athena/screen/public/screen_manager.h"
@@ skipping 223 matching lines @@
   // instead of exitting.
   if (new_window->type() == ui::wm::WINDOW_TYPE_NORMAL)
     SetInOverview(false);
 }
 
 void WindowManagerImpl::OnWindowDestroying(aura::Window* window) {
   if (window == container_)
     container_.reset();
 }
 
+void WindowManagerImpl::OnWindowStackingChanged(aura::Window* window) {
+  // TODO(skuhne): Use |window_list_provider_->IsValidWindow(window)| instead.
+  if (window->type() == ui::wm::WINDOW_TYPE_NORMAL) {
+    FOR_EACH_OBSERVER(WindowManagerObserver,
+                      observers_,
+                      OnActivityOrderHasChanged());
+  }
+}
+
 bool WindowManagerImpl::IsCommandEnabled(int command_id) const {
   return true;
 }
 
 bool WindowManagerImpl::OnAcceleratorFired(int command_id,
                                            const ui::Accelerator& accelerator) {
   switch (command_id) {
     case CMD_TOGGLE_OVERVIEW:
       ToggleOverview();
       break;
@@ skipping 112 matching lines @@
   DCHECK(!instance);
 }
 
 // static
 WindowManager* WindowManager::GetInstance() {
   DCHECK(instance);
   return instance;
 }
 
 }  // namespace athena