[Aura] Implement views-based applist.

ui/aura_shell/app_list/app_list_model.cc

Index: ui/aura_shell/app_list/app_list_model.cc
diff --git a/ui/aura_shell/app_list/app_list_model.cc b/ui/aura_shell/app_list/app_list_model.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8cc531befb126840175e5e9664dd388ba1f59b4a
--- /dev/null
+++ b/ui/aura_shell/app_list/app_list_model.cc
@@ -0,0 +1,32 @@
+// 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.
+
+#include "ui/aura_shell/app_list/app_list_model.h"
+
+namespace aura_shell {
+
+AppListModel::AppListModel() {
+}
+
+AppListModel::~AppListModel() {
+}
+
+void AppListModel::AddGroup(AppListItemGroupModel* group) {
+  groups_.Add(group);
+}
+
+AppListItemGroupModel* AppListModel::GetGroup(int index) {
+  DCHECK(index >= 0 && index < group_count());
+  return groups_.item_at(index);
+}
+
+void AppListModel::AddObserver(ui::ListModelObserver* observer) {
+  groups_.AddObserver(observer);
+}
+
+void AppListModel::RemoveObserver(ui::ListModelObserver* observer) {
+  groups_.RemoveObserver(observer);
+}
+
+}  // namespace aura_shell