Disable folder UI when app sync is disabled

ui/app_list/app_list_model_unittest.cc

 // Copyright 2013 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/app_list/app_list_model.h"
 
 #include <map>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 213 matching lines @@
   // Ensure order is preserved.
   for (size_t i = 1; i < num_apps; ++i) {
     EXPECT_TRUE(
         model_.top_level_item_list()->item_at(i)->position().GreaterThan(
             model_.top_level_item_list()->item_at(i - 1)->position()));
   }
 }
 
 class AppListModelFolderTest : public AppListModelTest {
  public:
-  AppListModelFolderTest() {}
+  AppListModelFolderTest() {
+    model_.SetFoldersEnabled(true);
+  }
   virtual ~AppListModelFolderTest() {}
 
   // testing::Test overrides:
   virtual void SetUp() OVERRIDE {
     AppListModelTest::SetUp();
   }
   virtual void TearDown() OVERRIDE {
     AppListModelTest::TearDown();
   }
 
@@ skipping 214 matching lines @@
 
   // Should not be able to move from an OEM folder with MoveItemToFolderAt.
   AppListItem* item1 = new AppListItem("Item 1");
   model_.AddItemToFolder(item1, folder_id);
   syncer::StringOrdinal item1_pos = item1->position();
   bool move_res = model_.MoveItemToFolderAt(item1, "", syncer::StringOrdinal());
   EXPECT_FALSE(move_res);
   EXPECT_TRUE(item1->position().Equals(item1_pos));
 }
 
+TEST_F(AppListModelFolderTest, DisableFolders) {
+  // Set up a folder with two items and an OEM folder with one item.
+  AppListFolderItem* folder =
+      new AppListFolderItem("folder1", AppListFolderItem::FOLDER_TYPE_NORMAL);
+  model_.AddItem(folder);
+  std::string folder_id = folder->id();
+  AppListItem* item0 = new AppListItem("Item 0");
+  model_.AddItemToFolder(item0, folder_id);
+  AppListItem* item1 = new AppListItem("Item 1");
+  model_.AddItemToFolder(item1, folder_id);
+  AppListFolderItem* folder_item = model_.FindFolderItem(folder_id);
+  ASSERT_TRUE(folder_item);
+  EXPECT_EQ(2u, folder_item->item_list()->item_count());
+  AppListFolderItem* oem_folder =
+      new AppListFolderItem("oem_folder", AppListFolderItem::FOLDER_TYPE_OEM);
+  model_.AddItem(oem_folder);
+  AppListItem* oem_item = new AppListItem("OEM Item");
+  std::string oem_folder_id = oem_folder->id();
+  model_.AddItemToFolder(oem_item, oem_folder_id);
+  EXPECT_EQ("folder1,oem_folder", GetModelContents());
+
+  // Disable folders. Ensure non-oem folder is removed.
+  model_.SetFoldersEnabled(false);
+  ASSERT_FALSE(model_.FindFolderItem(folder_id));
+  ASSERT_TRUE(model_.FindFolderItem(oem_folder_id));
+  EXPECT_EQ("Item 0,Item 1,oem_folder", GetModelContents());
+
+  // Ensure folder creation fails.
+  EXPECT_EQ(std::string(), model_.MergeItems(item0->id(), item1->id()));
+}
+
 }  // namespace app_list