Introduce FastShowPickler which will be used for app list cold start.

chrome/chrome_browser_ui.gypi

 # Copyright 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_ui',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 95 matching lines @@
         'browser/ui/android/tab_model/tab_model.h',
         'browser/ui/android/tab_model/tab_model_list.cc',
         'browser/ui/android/tab_model/tab_model_list.h',
         'browser/ui/android/tab_restore_service_delegate_android.cc',
         'browser/ui/android/validation_message_bubble_android.h',
         'browser/ui/android/validation_message_bubble_android.cc',
         'browser/ui/android/website_settings_popup_android.cc',
         'browser/ui/android/website_settings_popup_android.h',
         'browser/ui/android/window_android_helper.cc',
         'browser/ui/android/window_android_helper.h',
+        'browser/ui/app_list/fast_show_pickler.cc',
+        'browser/ui/app_list/fast_show_pickler.h',
         'browser/ui/app_list/app_context_menu.cc',
         'browser/ui/app_list/app_context_menu.h',
         'browser/ui/app_list/app_context_menu_delegate.h',
         'browser/ui/app_list/app_list_controller_delegate.cc',
         'browser/ui/app_list/app_list_controller_delegate.h',
         'browser/ui/app_list/app_list_service.cc',
         'browser/ui/app_list/app_list_service.h',
         'browser/ui/app_list/app_list_service_ash.h',
         'browser/ui/app_list/app_list_service_disabled.cc',
         'browser/ui/app_list/app_list_service_impl.cc',
@@ skipping 3087 matching lines @@
             'browser/ui/webui/local_discovery/local_discovery_ui.cc',
             'browser/ui/webui/local_discovery/local_discovery_ui.h',
             'browser/ui/webui/local_discovery/local_discovery_ui_handler.cc',
             'browser/ui/webui/local_discovery/local_discovery_ui_handler.h',
           ],
         }],
       ],
     },
   ],
 }