Begin to enable extension APIs in Extension Service Worker.

extensions/extensions.gypi

Index: extensions/extensions.gypi
diff --git a/extensions/extensions.gypi b/extensions/extensions.gypi
index c5486f788217fb00e5303672401748c7ebc41124..4c975cbde83be2dc4a03e363888bd63be0af7eee 100644
--- a/extensions/extensions.gypi
+++ b/extensions/extensions.gypi
@@ -91,6 +91,7 @@
       'common/features/feature.h',
       'common/features/feature_provider.cc',
       'common/features/feature_provider.h',
+      'common/features/feature_util.cc',
       'common/features/feature_util.h',
       'common/features/json_feature_provider_source.cc',
       'common/features/json_feature_provider_source.h',
@@ -610,6 +611,8 @@
       'browser/extension_request_limiting_throttle.cc',
       'browser/extension_request_limiting_throttle.h',
       'browser/extension_scoped_prefs.h',
+      'browser/extension_service_worker_message_filter.cc',
+      'browser/extension_service_worker_message_filter.h',
       'browser/extension_system.cc',
       'browser/extension_system.h',
       'browser/extension_system_provider.cc',
@@ -1009,6 +1012,10 @@
       'renderer/scripts_run_info.h',
       'renderer/send_request_natives.cc',
       'renderer/send_request_natives.h',
+      'renderer/service_worker_data.cc',
+      'renderer/service_worker_data.h',
+      'renderer/service_worker_request_sender.cc',
+      'renderer/service_worker_request_sender.h',
       'renderer/set_icon_natives.cc',
       'renderer/set_icon_natives.h',
       'renderer/static_v8_external_one_byte_string_resource.cc',
@@ -1038,6 +1045,8 @@
       'renderer/web_ui_injection_host.h',
       'renderer/worker_script_context_set.cc',
       'renderer/worker_script_context_set.h',
+      'renderer/worker_thread_dispatcher.cc',
+      'renderer/worker_thread_dispatcher.h',
     ],
     'extensions_renderer_sources_wifi_display': [
       'renderer/api/display_source/wifi_display/wifi_display_elementary_stream_descriptor.cc',