Field trial removing tiles from NTP if URL is already open - for 1993 clients

chrome/chrome_browser.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',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 740 matching lines @@
         'browser/history/history_types.cc',
         'browser/history/history_types.h',
         'browser/history/in_memory_database.cc',
         'browser/history/in_memory_database.h',
         'browser/history/in_memory_history_backend.cc',
         'browser/history/in_memory_history_backend.h',
         'browser/history/in_memory_url_index.cc',
         'browser/history/in_memory_url_index.h',
         'browser/history/in_memory_url_index_types.cc',
         'browser/history/in_memory_url_index_types.h',
+        'browser/history/most_visited_tiles_experiment.cc',
+        'browser/history/most_visited_tiles_experiment.h',
         'browser/history/page_usage_data.cc',
         'browser/history/page_usage_data.h',
         'browser/history/query_parser.cc',
         'browser/history/query_parser.h',
         'browser/history/scored_history_match.cc',
         'browser/history/scored_history_match.h',
         'browser/history/select_favicon_frames.cc',
         'browser/history/select_favicon_frames.h',
         'browser/history/snippet.cc',
         'browser/history/snippet.h',
@@ skipping 2569 matching lines @@
             'package_name': 'org/chromium/chrome/browser/ui/toolbar',
             'template_deps': ['browser/ui/toolbar/toolbar_model_security_level_list.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }