app_list: Paint background for app item title.

ui/app_list/app_list.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
       'target_name': 'app_list',
       'type': '<(component)',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '../../skia/skia.gyp:skia',
         '../compositor/compositor.gyp:compositor',
         '../ui.gyp:ui',
         '../views/views.gyp:views',
       ],
       'defines': [
         'APP_LIST_IMPLEMENTATION',
       ],
       'sources': [
         'app_list_bubble_border.cc',
         'app_list_bubble_border.h',
+        'app_list_constants.cc',
+        'app_list_constants.h',
         'app_list_export.h',
         'app_list_item_model.cc',
         'app_list_item_model.h',
         'app_list_item_model_observer.h',
         'app_list_item_view.cc',
         'app_list_item_view.h',
         'app_list_model.cc',
         'app_list_model.h',
         'app_list_switches.cc',
         'app_list_switches.h',
@@ skipping 45 matching lines @@
       'sources': [
         'apps_grid_view_unittest.cc',
         'pagination_model_unittest.cc',
         'test/app_list_test_suite.cc',
         'test/app_list_test_suite.h',
         'test/run_all_unittests.cc',
       ],
     },
   ],
 }