Histogram the scheme of an origin on the 1st navigation to it.

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.
 
 {
   'variables': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 589 matching lines @@
       'browser/status_icons/status_icon_menu_model.h',
       'browser/status_icons/status_icon_observer.h',
       'browser/status_icons/status_tray.cc',
       'browser/status_icons/status_tray.h',
       'browser/storage/durable_storage_permission_context.cc',
       'browser/storage/durable_storage_permission_context.h',
       'browser/storage/storage_info_fetcher.cc',
       'browser/storage/storage_info_fetcher.h',
       'browser/tab_contents/navigation_metrics_recorder.cc',
       'browser/tab_contents/navigation_metrics_recorder.h',
+      'browser/tab_contents/origins_seen_service.cc',
+      'browser/tab_contents/origins_seen_service.h',
+      'browser/tab_contents/origins_seen_service_factory.cc',
+      'browser/tab_contents/origins_seen_service_factory.h',
       'browser/tab_contents/retargeting_details.h',
       'browser/tab_contents/tab_util.cc',
       'browser/tab_contents/tab_util.h',
       'browser/task_management/web_contents_tags.cc',
       'browser/task_management/web_contents_tags.h',
       'browser/task_profiler/task_profiler_data_serializer.cc',
       'browser/task_profiler/task_profiler_data_serializer.h',
       'browser/thumbnails/content_analysis.cc',
       'browser/thumbnails/content_analysis.h',
       'browser/thumbnails/content_based_thumbnailing_algorithm.cc',
@@ skipping 3581 matching lines @@
             '../components/components.gyp:rlz',
             '../components/components.gyp:search_engines',
             '../rlz/rlz.gyp:rlz_lib',
             'common',
           ],
         },
       ],
     }],
   ],
 }