[Suggestions] Adding a Thumbnail Manager for the Suggestions Service

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 1233 matching lines @@
         'browser/safe_browsing/two_phase_uploader_unittest.cc',
         'browser/search/hotword_service_unittest.cc',
         'browser/search/iframe_source_unittest.cc',
         'browser/search/instant_service_unittest.cc',
         'browser/search/instant_unittest_base.cc',
         'browser/search/instant_unittest_base.h',
         'browser/search/most_visited_iframe_source_unittest.cc',
         'browser/search/search_unittest.cc',
         'browser/search/search_android_unittest.cc',
         'browser/search/suggestions/suggestions_service_unittest.cc',
+        'browser/search/suggestions/thumbnail_manager_unittest.cc',
         'browser/search_engines/default_search_manager_unittest.cc',
         'browser/search_engines/default_search_pref_migration_unittest.cc',
         'browser/search_engines/default_search_policy_handler_unittest.cc',
         'browser/search_engines/search_host_to_urls_map_unittest.cc',
         'browser/search_engines/search_provider_install_data_unittest.cc',
         'browser/search_engines/template_url_fetcher_unittest.cc',
         'browser/search_engines/template_url_service_util_unittest.cc',
         'browser/search_engines/template_url_service_sync_unittest.cc',
         'browser/search_engines/template_url_service_unittest.cc',
         'browser/search_engines/template_url_parser_unittest.cc',
@@ skipping 1553 matching lines @@
             'unit_tests.isolate',
           ],
           'sources': [
             'unit_tests.isolate',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }