Add a counter to calculate the total size of site data.

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.
 {
   'variables': {
     'chrome_unit_tests_sources': [
       # histograms.xml is analyzed by AboutFlagsHistogramTest, so this
       # dependency is needed to make commit bots run unit_tests on
       # histograms.xml changes.
       '../tools/metrics/histograms/histograms.xml',
@@ skipping 43 matching lines @@
       'browser/browsing_data/browsing_data_indexed_db_helper_unittest.cc',
       'browser/browsing_data/browsing_data_local_storage_helper_unittest.cc',
       'browser/browsing_data/browsing_data_quota_helper_unittest.cc',
       'browser/browsing_data/browsing_data_remover_test_util.cc',
       'browser/browsing_data/browsing_data_remover_test_util.h',
       'browser/browsing_data/browsing_data_remover_unittest.cc',
       'browser/browsing_data/browsing_data_service_worker_helper_unittest.cc',
       'browser/browsing_data/cookies_tree_model_unittest.cc',
       'browser/browsing_data/origin_filter_builder_unittest.cc',
       'browser/browsing_data/registrable_domain_filter_builder_unittest.cc',
+      'browser/browsing_data/site_data_size_collector_unittest.cc',
       'browser/budget_service/background_budget_service_unittest.cc',
       'browser/chrome_browser_application_mac_unittest.mm',
       'browser/chrome_content_browser_client_unittest.cc',
       'browser/chrome_process_singleton_win_unittest.cc',
       'browser/command_updater_unittest.cc',
       'browser/component_updater/chrome_component_updater_configurator_unittest.cc',
       'browser/component_updater/sth_set_component_installer_unittest.cc',
       'browser/component_updater/subresource_filter_component_installer_unittest.cc',
       'browser/component_updater/supervised_user_whitelist_installer_unittest.cc',
       'browser/content_settings/content_settings_default_provider_unittest.cc',
@@ skipping 2947 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }