Test cases for FolderHeaderView.

ui/app_list/test/app_list_test_model.h

Index: ui/app_list/test/app_list_test_model.h
diff --git a/ui/app_list/test/app_list_test_model.h b/ui/app_list/test/app_list_test_model.h
index b39236c6ca5125da4161b04a6d5ccb2210f87f56..2d2fc9568876c209f899d8e5c469081cf665e6ab 100644
--- a/ui/app_list/test/app_list_test_model.h
+++ b/ui/app_list/test/app_list_test_model.h
@@ -7,6 +7,7 @@
 
 #include <string>
 
+#include "ui/app_list/app_list_folder_item.h"
 #include "ui/app_list/app_list_item.h"
 #include "ui/app_list/app_list_model.h"
 
@@ -48,7 +49,9 @@ class AppListTestModel : public AppListModel {
   void PopulateApps(int n);
 
   // Creates and populate a folder with |n| test apps in it.
-  void CreateAndPopulateFolderWithApps(int n);
+  AppListFolderItem* CreateAndPopulateFolderWithApps(int n);
+
+  AppListFolderItem* CreateAndAddOemFolder(const std::string& id);
 
   // Populate the model with an item titled "Item |id|".
   void PopulateAppWithId(int id);