Experimental app list: "All apps" button has a folder-like icon.

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': [
     {
@@ skipping 56 matching lines @@
         'cocoa/apps_search_box_controller.h',
         'cocoa/apps_search_box_controller.mm',
         'cocoa/apps_search_results_controller.h',
         'cocoa/apps_search_results_controller.mm',
         'cocoa/apps_search_results_model_bridge.h',
         'cocoa/apps_search_results_model_bridge.mm',
         'cocoa/item_drag_controller.h',
         'cocoa/item_drag_controller.mm',
         'cocoa/scroll_view_with_no_scrollbars.h',
         'cocoa/scroll_view_with_no_scrollbars.mm',
+        'folder_image.cc',
+        'folder_image.h',
         'folder_image_source.cc',
         'folder_image_source.h',
         'pagination_controller.cc',
         'pagination_controller.h',
         'pagination_model.cc',
         'pagination_model.h',
         'pagination_model_observer.h',
         'search_box_model.cc',
         'search_box_model.h',
         'search_box_model_observer.h',
@@ skipping 162 matching lines @@
         'app_list_item_list_unittest.cc',
         'app_list_model_unittest.cc',
         'pagination_model_unittest.cc',
         'cocoa/app_list_view_controller_unittest.mm',
         'cocoa/app_list_window_controller_unittest.mm',
         'cocoa/apps_grid_controller_unittest.mm',
         'cocoa/apps_search_box_controller_unittest.mm',
         'cocoa/apps_search_results_controller_unittest.mm',
         'cocoa/test/apps_grid_controller_test_helper.h',
         'cocoa/test/apps_grid_controller_test_helper.mm',
+        'folder_image_unittest.cc',
         'search/history_data_store_unittest.cc',
         'search/mixer_unittest.cc',
         'search/term_break_iterator_unittest.cc',
         'search/tokenized_string_char_iterator_unittest.cc',
         'search/tokenized_string_match_unittest.cc',
         'search/tokenized_string_unittest.cc',
         'test/run_all_unittests.cc',
         'views/app_list_main_view_unittest.cc',
         'views/app_list_view_unittest.cc',
         'views/apps_grid_view_unittest.cc',
@@ skipping 83 matching lines @@
                 '../../sandbox/sandbox.gyp:sandbox',
                 '../../content/content.gyp:content_startup_helper_win',
               ],
             }],
           ],
         },
       ],
     }],  # toolkit_views==1
   ],
 }