Refactors DimWindow and moves to ash/common

ash/root_window_controller.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 "ash/root_window_controller.h"
 
 #include <queue>
 #include <vector>
 
 #include "ash/aura/aura_layout_manager_adapter.h"
@@ skipping 376 matching lines @@
         GetContainer(kShellWindowId_LockScreenContainersContainer);
     modal_container_id = kShellWindowId_LockSystemModalContainer;
   } else {
     modal_container_id = kShellWindowId_SystemModalContainer;
   }
   aura::Window* modal_container = GetContainer(modal_container_id);
   SystemModalContainerLayoutManager* modal_layout_manager = nullptr;
   modal_layout_manager = static_cast<SystemModalContainerLayoutManager*>(
       modal_container->layout_manager());
 
-  if (modal_layout_manager->has_modal_background())
+  if (modal_layout_manager->has_window_dimmer())
     blocking_container = modal_container;
   else
     modal_container = nullptr;  // Don't check modal dialogs.
 
   // In normal session.
   if (!blocking_container)
     return true;
 
   if (!IsWindowAboveContainer(window, blocking_container))
     return false;
@@ skipping 318 matching lines @@
   shell->InitRootWindow(root_window);
 
   wm_root_window_controller_->CreateContainers();
 
   CreateSystemWallpaper(first_run_after_boot);
 
   InitLayoutManagers();
   InitTouchHuds();
 
   if (Shell::GetPrimaryRootWindowController()
-          ->GetSystemModalLayoutManager(NULL)
-          ->has_modal_background()) {
-    GetSystemModalLayoutManager(NULL)->CreateModalBackground();
+          ->GetSystemModalLayoutManager(nullptr)
+          ->has_window_dimmer()) {
+    GetSystemModalLayoutManager(nullptr)->CreateModalBackground();
   }
 
   WmShell::Get()->AddShellObserver(this);
 
   wm_root_window_controller_->root_window_layout_manager()->OnWindowResized();
   if (root_window_type == PRIMARY) {
     shell->InitKeyboard();
   } else {
     ash_host_->AsWindowTreeHost()->Show();
 
@@ skipping 171 matching lines @@
     aura::Window* primary_root_window = Shell::GetInstance()
                                             ->window_tree_host_manager()
                                             ->GetPrimaryRootWindow();
     return GetRootWindowSettings(primary_root_window)->controller;
   }
 
   return GetRootWindowSettings(root_window)->controller;
 }
 
 }  // namespace ash