arc: Handle position conflict in app list items.

chrome/test/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
@@ skipping 4898 matching lines @@
     ]
   }
   if (safe_browsing_mode == 1 && enable_extensions) {
     sources += [ "../browser/extensions/blacklist_unittest.cc" ]
   }
   if (enable_app_list) {
     sources += [
       "../browser/apps/drive/drive_app_mapping_unittest.cc",
       "../browser/ui/app_list/app_context_menu_unittest.cc",
       "../browser/ui/app_list/app_list_service_unittest.cc",
+      "../browser/ui/app_list/app_list_syncable_service_unittest.cc",
       "../browser/ui/app_list/app_list_test_util.cc",
       "../browser/ui/app_list/app_list_test_util.h",
       "../browser/ui/app_list/arc/arc_app_test.cc",
       "../browser/ui/app_list/arc/arc_app_test.h",
       "../browser/ui/app_list/arc/arc_app_unittest.cc",
       "../browser/ui/app_list/extension_app_model_builder_unittest.cc",
       "../browser/ui/app_list/profile_loader_unittest.cc",
       "../browser/ui/app_list/search/app_search_provider_unittest.cc",
       "../browser/ui/app_list/search/history_unittest.cc",
       "../browser/ui/app_list/search/launcher_search/launcher_search_icon_image_loader_unittest.cc",
@@ skipping 262 matching lines @@
 }
 
 if (is_win) {
   loadable_module("conflicts_dll") {
     testonly = true
     sources = [
       "conflicts/conflicts_dll.cc",
     ]
   }
 }