aura: Implement app list M19 mock.

ash/app_list/app_list_item_group_view.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 ASH_APP_LIST_APP_LIST_ITEM_GROUP_VIEW_H_
-#define ASH_APP_LIST_APP_LIST_ITEM_GROUP_VIEW_H_
-#pragma once
-
-#include "ash/ash_export.h"
-#include "ui/base/models/list_model_observer.h"
-#include "ui/views/view.h"
-
-namespace ash {
-
-class AppListItemGroupModel;
-class AppListItemViewListener;
-
-// AppListItemGroupView displays its children tiles in a grid.
-class ASH_EXPORT AppListItemGroupView
-    : public views::View,
-      public ui::ListModelObserver {
- public:
-  AppListItemGroupView(AppListItemGroupModel* model,
-                       AppListItemViewListener* listener);
-  virtual ~AppListItemGroupView();
-
-  // Sets tiles per row.
-  void SetTilesPerRow(int tiles_per_row);
-
-  // Gets currently focused tile.
-  views::View* GetFocusedTile();
-
-  // Updates tiles page when a tile gets focus.
-  void UpdateFocusedTile(views::View* tile);
-
- private:
-  // Updates from model.
-  void Update();
-
-  // Sets focused tile by index.
-  void SetFocusedTileByIndex(int index);
-
-  // Overridden from views::View:
-  virtual bool OnKeyPressed(const views::KeyEvent& event) OVERRIDE;
-
-  // Overridden from ListModelObserver:
-  virtual void ListItemsAdded(int start, int count) OVERRIDE;
-  virtual void ListItemsRemoved(int start, int count) OVERRIDE;
-  virtual void ListItemsChanged(int start, int count) OVERRIDE;
-
-  AppListItemGroupModel* model_;
-  AppListItemViewListener* listener_;
-
-  // Tiles per row.
-  int tiles_per_row_;
-
-  // Index of focused tile view.
-  int focused_index_;
-
-  DISALLOW_COPY_AND_ASSIGN(AppListItemGroupView);
-};
-
-}  // namespace ash
-
-#endif  // ASH_APP_LIST_APP_LIST_ITEM_GROUP_VIEW_H_