Show UI when a folder is empty.

ui/file_manager/file_manager/foreground/js/compiled_resources.gyp

 # 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.
 {
   'targets': [
     {
       'target_name': 'main',
       'variables': {
         'depends': [
           '../../../../../third_party/jstemplate/compiled_resources.gyp:jstemplate',
@@ skipping 60 matching lines @@
           './ui/commandbutton.js',
           './ui/file_manager_dialog_base.js',
           './app_installer.js',
           './app_state_controller.js',
           './column_visibility_controller.js',
           './cws_container_client.js',
           './dialog_action_controller.js',
           './dialog_type.js',
           './directory_contents.js',
           './directory_model.js',
+          './empty_folder_controller.js',
           './file_manager.js',
           './file_manager_commands.js',
           './file_selection.js',
           './file_tasks.js',
           './file_transfer_controller.js',
           './file_watcher.js',
           './folder_shortcuts_data_model.js',
           './gear_menu_controller.js',
           './import_controller.js',
           './launch_param.js',
@@ skipping 18 matching lines @@
           './task_controller.js',
           './toolbar_controller.js',
           './thumbnail_loader.js',
           './list_thumbnail_loader.js',
           './ui/banners.js',
           './ui/conflict_dialog.js',
           './ui/default_action_dialog.js',
           './ui/dialog_footer.js',
           './ui/directory_tree.js',
           './ui/drag_selector.js',
+          './ui/empty_folder.js',
           './ui/error_dialog.js',
           './ui/file_grid.js',
           './ui/file_list_selection_model.js',
           './ui/file_manager_ui.js',
           './ui/file_table.js',
           './ui/file_table_list.js',
           './ui/gear_menu.js',
           './ui/list_container.js',
           './ui/location_line.js',
           './ui/multi_profile_share_dialog.js',
@@ skipping 22 matching lines @@
           '../../../externs/platform.js',
           '../../common/js/externs.js',
         ],
       },
       'includes': [
         '../../../../../third_party/closure_compiler/compile_js.gypi'
       ],
     }
   ],
 }