Fix app list item indexing bug.

ui/app_list/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/ui.gni")
 import("//testing/test.gni")
 
 component("app_list") {
   sources = [
     "app_list_constants.cc",
@@ skipping 266 matching lines @@
     sources += [
       "views/app_list_main_view_unittest.cc",
       "views/app_list_view_unittest.cc",
       "views/apps_grid_view_unittest.cc",
       "views/folder_header_view_unittest.cc",
       "views/image_shadow_animator_unittest.cc",
       "views/search_box_view_unittest.cc",
       "views/search_result_answer_card_view_unittest.cc",
       "views/search_result_list_view_unittest.cc",
       "views/search_result_page_view_unittest.cc",
+      "views/search_result_tile_item_list_view_unittest.cc",
       "views/speech_view_unittest.cc",
       "views/test/apps_grid_view_test_api.cc",
       "views/test/apps_grid_view_test_api.h",
     ]
     deps += [
       "//ui/accessibility",
       "//ui/views",
       "//ui/views:test_support",
     ]
   }
 }