[Aura] Implement views-based applist.

ui/aura_shell/app_list/app_list_model.h

Index: ui/aura_shell/app_list/app_list_model.h
diff --git a/ui/aura_shell/app_list/app_list_model.h b/ui/aura_shell/app_list/app_list_model.h
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+++ b/ui/aura_shell/app_list/app_list_model.h
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+// 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 UI_AURA_SHELL_APP_LIST_APP_LIST_MODEL_H_
+#define UI_AURA_SHELL_APP_LIST_APP_LIST_MODEL_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "ui/aura_shell/app_list/app_list_item_group_model.h"
+#include "ui/aura_shell/aura_shell_export.h"
+#include "ui/base/models/list_model.h"
+
+namespace aura_shell {
+
+// Model for AppListView. It is consisted of a list of AppListItemGroupModels,
+// which in turn owns a list of AppListItemModels.
+class AURA_SHELL_EXPORT AppListModel
+    : public ui::ListModel<AppListItemGroupModel> {
+ public:
+  AppListModel();
+  virtual ~AppListModel();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AppListModel);
+};
+
+}  // namespace aura_shell
+
+#endif  // UI_AURA_SHELL_APP_LIST_APP_LIST_MODEL_H_