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

chrome/chrome_tests_unit.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': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 1339 matching lines @@
         'browser/thumbnails/content_analysis_unittest.cc',
         'browser/thumbnails/content_based_thumbnailing_algorithm_unittest.cc',
         'browser/thumbnails/render_widget_snapshot_taker_unittest.cc',
         'browser/thumbnails/simple_thumbnail_crop_unittest.cc',
         'browser/thumbnails/thumbnail_service_unittest.cc',
         'browser/translate/translate_browser_metrics_unittest.cc',
         'browser/translate/translate_manager_unittest.cc',
         'browser/translate/translate_prefs_unittest.cc',
         'browser/translate/translate_script_unittest.cc',
         'browser/ui/android/tab_model/tab_model_unittest.cc',
+        'browser/ui/app_list/fast_show_pickler_unittest.cc',
         'browser/ui/ash/event_rewriter_unittest.cc',
         'browser/ui/ash/ime_controller_chromeos_unittest.cc',
         'browser/ui/ash/launcher/chrome_launcher_controller_unittest.cc',
         'browser/ui/ash/launcher/launcher_context_menu_unittest.cc',
         'browser/ui/ash/screenshot_taker_unittest.cc',
         'browser/ui/ash/window_positioner_unittest.cc',
         'browser/ui/autofill/account_chooser_model_unittest.cc',
         'browser/ui/autofill/autocheckout_bubble_controller_unittest.cc',
         'browser/ui/autofill/autofill_dialog_controller_unittest.cc',
         'browser/ui/autofill/autofill_dialog_models_unittest.cc',
@@ skipping 1379 matching lines @@
               # more details.
               'DebugInformationFormat': '3',
               'ProgramDataBaseFileName': '<(PRODUCT_DIR)/unit_tests.exe.pdb',
             },
           },
         },
       ],
     }],
   ],  # 'conditions'
 }