Add more components to GN build.

components/domain_reliability.gypi

 # Copyright 2014 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': [
     {
+      # GN version: //components/domain_reliability
       'target_name': 'domain_reliability',
       'type': '<(component)',
       'dependencies': [
         '../base/base.gyp:base',
         '../components/components.gyp:keyed_service_core',
         '../content/content.gyp:content_browser',
         '../net/net.gyp:net',
         '../url/url.gyp:url_lib',
       ],
       'include_dirs': [
         '..',
       ],
       'defines': [
         'DOMAIN_RELIABILITY_IMPLEMENTATION',
       ],
       'sources': [
+        # Note: sources list duplicated in GN build.
         'domain_reliability/baked_in_configs.h',
         'domain_reliability/beacon.cc',
         'domain_reliability/beacon.h',
         'domain_reliability/clear_mode.h',
         'domain_reliability/config.cc',
         'domain_reliability/config.h',
         'domain_reliability/context.cc',
         'domain_reliability/context.h',
         'domain_reliability/dispatcher.cc',
         'domain_reliability/dispatcher.h',
@@ skipping 37 matching lines @@
                      '<(bake_in_configs_script)',
                      '<@(baked_in_configs)',
                      '<(baked_in_configs_cc)'],
           'process_outputs_as_sources': 1,
           'message': 'Baking in Domain Reliability configs',
         },
       ],
     },
   ],
 }