extensions: Add GN version of extensions_shell_and_test_pak and unittests target.

extensions/renderer/BUILD.gn

 # 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.
 
 # GYP version: extensions/extensions.gyp:extensions_renderer
 source_set("renderer") {
   sources = [
     "activity_log_converter_strategy.cc",
     "activity_log_converter_strategy.h",
     "api_activity_logger.cc",
@@ skipping 108 matching lines @@
     "static_v8_external_ascii_string_resource.cc",
     "static_v8_external_ascii_string_resource.h",
     "test_features_native_handler.cc",
     "test_features_native_handler.h",
     "user_gestures_native_handler.cc",
     "user_gestures_native_handler.h",
     "user_script_injector.cc",
     "user_script_injector.h",
     "user_script_set.cc",
     "user_script_set.h",
+    "user_script_set_manager.cc",
+    "user_script_set_manager.h",
     "utils_native_handler.cc",
     "utils_native_handler.h",
     "v8_context_native_handler.cc",
     "v8_context_native_handler.h",
     "v8_schema_registry.cc",
     "v8_schema_registry.h",
   ]
 
   deps = [
     "//chrome:resources",
@@ skipping 17 matching lines @@
       "send_request_natives.cc",
     ]
   }
 
   if (is_win) {
     cflags = [
       "/wd4267", # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     ]
   }
 }