aura: Implement app list M19 mock.

ash/app_list/app_list_model_view.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_MODEL_VIEW_H_
+#define ASH_APP_LIST_APP_LIST_MODEL_VIEW_H_
+#pragma once
+
+#include "ui/base/models/list_model_observer.h"
+#include "ui/views/view.h"
+
+namespace views {
+class ButtonListener;
+}
+
+namespace ash {
+
+class AppListModel;
+
+// AppListModelView displays the UI for an AppListModel.
+class AppListModelView : public views::View,
+                         public ui::ListModelObserver {
+ public:
+  explicit AppListModelView(views::ButtonListener* listener);
+  virtual ~AppListModelView();
+
+  // Sets |model| to use. Note this does not take ownership of |model|.
+  void SetModel(AppListModel* model);
+
+ private:
+  // Updates from model.
+  void Update();
+
+  // Overridden from views::View:
+  virtual void Layout() 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;
+
+  AppListModel* model_;  // Owned by parent AppListView.
+  views::ButtonListener* listener_;
+
+  DISALLOW_COPY_AND_ASSIGN(AppListModelView);
+};
+
+}  // namespace ash
+
+#endif  // ASH_APP_LIST_APP_LIST_MODEL_VIEW_H_