[Aura] Refactor and update app list window.

chrome/browser/ui/views/aura/app_list_window.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_AURA_APP_LIST_WINDOW_H_
 #define CHROME_BROWSER_UI_VIEWS_AURA_APP_LIST_WINDOW_H_
 #pragma once
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/tab_first_render_watcher.h"
-#include "ui/aura/desktop_observer.h"
-#include "ui/gfx/compositor/layer_animation_observer.h"
+#include "ui/aura_shell/shell_delegate.h"
 #include "views/widget/widget_delegate.h"
 
 class DOMView;
 
 namespace views {
 class Widget;
 }
 
 class AppListWindow : public views::WidgetDelegate,
-                      public aura::DesktopObserver,
-                      public ui::LayerAnimationObserver,
                       public TabFirstRenderWatcher::Delegate {
  public:
-  // Show/hide app list window.
-  static void SetVisible(bool visible);
-
-  // Whether app list window is visible (shown or being shown).
-  static bool IsVisible();
+  explicit AppListWindow(const aura_shell::SetWidgetCallback& callback);
 
  private:
-  AppListWindow();
   virtual ~AppListWindow();
 
   // views::WidgetDelegate overrides:
   virtual void DeleteDelegate() OVERRIDE;
   virtual views::View* GetContentsView() OVERRIDE;
-  virtual void WindowClosing() OVERRIDE;
   virtual views::Widget* GetWidget() OVERRIDE;
   virtual const views::Widget* GetWidget() const OVERRIDE;
 
-  // aura::DesktopObserver overrides:
-  virtual void OnActiveWindowChanged(aura::Window* active) OVERRIDE;
-
-  // ui::LayerAnimationObserver overrides:
-  virtual void OnLayerAnimationEnded(
-      const ui::LayerAnimationSequence* sequence) OVERRIDE;
-  virtual void OnLayerAnimationAborted(
-      const ui::LayerAnimationSequence* sequence) OVERRIDE;
-  virtual void OnLayerAnimationScheduled(
-      const ui::LayerAnimationSequence* sequence) OVERRIDE;
-
   // TabFirstRenderWatcher::Delegate implementation:
   virtual void OnRenderHostCreated(RenderViewHost* host) OVERRIDE;
   virtual void OnTabMainFrameLoaded() OVERRIDE;
   virtual void OnTabMainFrameFirstRender() OVERRIDE;
 
   // Initializes the window.
   void Init();
 
-  // Shows/hides the window.
-  void DoSetVisible(bool visible);
-
-  // Current visible app list window.
-  static AppListWindow* instance_;
-
   views::Widget* widget_;
   DOMView* contents_;
-  bool is_visible_;
 
   // Monitors TabContents and set |content_rendered_| flag when it's rendered.
   scoped_ptr<TabFirstRenderWatcher> tab_watcher_;
 
-  // Flag of whether the web contents is rendered. Showing animation is
-  // deferred until this flag is set to true.
-  bool content_rendered_;
+  // Callback to set app list widget when it's ready.
+  aura_shell::SetWidgetCallback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListWindow);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_AURA_APP_LIST_WINDOW_H_