Introduce activation scope logic.

components/subresource_filter.gypi

 # Copyright 2016 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/subresource_filter/core/browser
       'target_name': 'subresource_filter_core_browser',
       'type': 'static_library',
@@ skipping 46 matching lines @@
         '../third_party/flatbuffers/flatbuffers.gyp:flatbuffers',
         '../url/url.gyp:url_lib',
         'subresource_filter_core_common_ruleset_flatbuffer',
         'subresource_filter_core_common_ruleset_proto',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         # Note: sources list duplicated in GN build.
+        'subresource_filter/core/common/activation_scope.cc',
+        'subresource_filter/core/common/activation_scope.h',
         'subresource_filter/core/common/activation_state.cc',
         'subresource_filter/core/common/activation_state.h',
         'subresource_filter/core/common/closed_hash_map.h',
         'subresource_filter/core/common/fuzzy_pattern_matching.cc',
         'subresource_filter/core/common/fuzzy_pattern_matching.h',
         'subresource_filter/core/common/indexed_ruleset.cc',
         'subresource_filter/core/common/indexed_ruleset.h',
         'subresource_filter/core/common/knuth_morris_pratt.h',
         'subresource_filter/core/common/memory_mapped_ruleset.cc',
         'subresource_filter/core/common/memory_mapped_ruleset.h',
@@ skipping 131 matching lines @@
             'subresource_filter/content/browser/content_subresource_filter_driver_factory.cc',
             'subresource_filter/content/browser/content_subresource_filter_driver_factory.h',
             'subresource_filter/content/browser/subresource_filter_navigation_throttle.cc',
             'subresource_filter/content/browser/subresource_filter_navigation_throttle.h',
           ],
         },
       ],
     }],
   ],
 }