Adds AppListDelegate to AppList that is notified on visibility changes

ash/app_list/app_list_presenter_delegate.h

 // 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.
 
 #ifndef ASH_APP_LIST_APP_LIST_PRESENTER_DELEGATE_H_
 #define ASH_APP_LIST_APP_LIST_PRESENTER_DELEGATE_H_
 
 #include <stdint.h>
 
 #include "ash/ash_export.h"
 #include "ash/common/shelf/wm_shelf_observer.h"
 #include "ash/common/shell_observer.h"
 #include "base/macros.h"
 #include "ui/app_list/presenter/app_list_presenter_delegate.h"
 #include "ui/events/event_handler.h"
 #include "ui/keyboard/keyboard_controller_observer.h"
 
 namespace app_list {
 class AppListPresenterImpl;
 class AppListView;
 class AppListViewDelegateFactory;
 }
 
 namespace ui {
 class LocatedEvent;
 }
 
 namespace ash {
 
-// Non-Mus+ash implementation of AppListPresetnerDelegate.
+// Non-Mus+ash implementation of AppListPresenterDelegate.
 // Responsible for laying out the app list UI as well as updating the Shelf
 // launch icon as the state of the app list changes. Listens to shell events
 // and touches/mouse clicks outside the app list to auto dismiss the UI or
 // update its layout as necessary.
 class ASH_EXPORT AppListPresenterDelegate
     : public app_list::AppListPresenterDelegate,
       public ui::EventHandler,
       public keyboard::KeyboardControllerObserver,
       public ShellObserver,
       public WmShelfObserver {
@@ skipping 44 matching lines @@
 
   // Owned by its widget.
   app_list::AppListView* view_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(AppListPresenterDelegate);
 };
 
 }  // namespace ash
 
 #endif  // ASH_APP_LIST_APP_LIST_PRESENTER_DELEGATE_H_