Refactors DimWindow and moves to ash/common

ash/common/wm_root_window_controller.cc

 // Copyright 2016 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/common/wm_root_window_controller.h"
 
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/wallpaper/wallpaper_delegate.h"
 #include "ash/common/wallpaper/wallpaper_widget_controller.h"
 #include "ash/common/wm/root_window_layout_manager.h"
 #include "ash/common/wm/workspace/workspace_layout_manager.h"
 #include "ash/common/wm/workspace_controller.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "base/memory/ptr_util.h"
 
 namespace ash {
 namespace {
 
 // Creates a new window for use as a container.
 WmWindow* CreateContainer(int window_id, const char* name, WmWindow* parent) {
-  WmWindow* window = WmShell::Get()->NewContainerWindow();
+  WmWindow* window = WmShell::Get()->NewWindow(ui::wm::WINDOW_TYPE_UNKNOWN,
+                                               ui::LAYER_NOT_DRAWN);
   window->SetShellWindowId(window_id);
   window->SetName(name);
   parent->AddChild(window);
   if (window_id != kShellWindowId_UnparentedControlContainer)
     window->Show();
   return window;
 }
 
 }  // namespace
 
@@ skipping 224 matching lines @@
   WmWindow* default_container =
       root_->GetChildByShellWindowId(kShellWindowId_DefaultContainer);
   workspace_controller_.reset(new WorkspaceController(default_container));
 }
 
 void WmRootWindowController::DeleteWorkspaceController() {
   workspace_controller_.reset();
 }
 
 }  // namespace ash