aura: Implement app list M19 mock.

ash/app_list/app_list_model.cc

Index: ash/app_list/app_list_model.cc
diff --git a/ash/app_list/app_list_model.cc b/ash/app_list/app_list_model.cc
index 8362dd67c69f6f395f0527a09ac14a8ce35fdff4..d0eb2359a1fddbe3c3d2d2775ccceff1b404be91 100644
--- a/ash/app_list/app_list_model.cc
+++ b/ash/app_list/app_list_model.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -12,21 +12,21 @@ AppListModel::AppListModel() {
 AppListModel::~AppListModel() {
 }
 
-void AppListModel::AddGroup(AppListItemGroupModel* group) {
-  groups_.Add(group);
+void AppListModel::AddItem(AppListItemModel* item) {
+  items_.Add(item);
 }
 
-AppListItemGroupModel* AppListModel::GetGroup(int index) {
-  DCHECK(index >= 0 && index < group_count());
-  return groups_.item_at(index);
+AppListItemModel* AppListModel::GetItem(int index) {
+  DCHECK(index >= 0 && index < item_count());

[sky, 2012/03/01 00:26:57]

The same check is in ListModel::item_at, so nuke this.

[xiyuan, 2012/03/01 19:58:47]

Done.

+  return items_.item_at(index);
 }
 
 void AppListModel::AddObserver(ui::ListModelObserver* observer) {
-  groups_.AddObserver(observer);
+  items_.AddObserver(observer);
 }
 
 void AppListModel::RemoveObserver(ui::ListModelObserver* observer) {
-  groups_.RemoveObserver(observer);
+  items_.RemoveObserver(observer);
 }
 
 }  // namespace ash