Test cases for FolderHeaderView.

ui/app_list/test/app_list_test_model.cc

Index: ui/app_list/test/app_list_test_model.cc
diff --git a/ui/app_list/test/app_list_test_model.cc b/ui/app_list/test/app_list_test_model.cc
index 527383e199b4464ebda950dd1a6a6626c89d55c3..66d2a6924ea83f5d173d14645dbfa928425ff185 100644
--- a/ui/app_list/test/app_list_test_model.cc
+++ b/ui/app_list/test/app_list_test_model.cc
@@ -69,7 +69,7 @@ void AppListTestModel::PopulateApps(int n) {
     CreateAndAddItem(GetItemName(start_index + i));
 }
 
-void AppListTestModel::CreateAndPopulateFolderWithApps(int n) {
+AppListFolderItem* AppListTestModel::CreateAndPopulateFolderWithApps(int n) {
   DCHECK_GT(n, 1);
   int start_index = static_cast<int>(top_level_item_list()->item_count());
   AppListTestItem* item = CreateAndAddItem(GetItemName(start_index));
@@ -78,6 +78,16 @@ void AppListTestModel::CreateAndPopulateFolderWithApps(int n) {
     AppListTestItem* new_item = CreateAndAddItem(GetItemName(start_index + i));
     merged_item_id = AppListModel::MergeItems(merged_item_id, new_item->id());
   }
+  AppListItem* merged_item = FindItem(merged_item_id);
+  DCHECK(merged_item->GetItemType() == AppListFolderItem::kItemType);
+  return static_cast<AppListFolderItem*>(merged_item);
+}
+
+AppListFolderItem* AppListTestModel::CreateAndAddOemFolder(
+    const std::string& id) {
+  AppListFolderItem* folder =
+      new AppListFolderItem(id, AppListFolderItem::FOLDER_TYPE_OEM);
+  return static_cast<AppListFolderItem*>(AddItem(folder));
 }
 
 void AppListTestModel::PopulateAppWithId(int id) {