Add GN split_list function

tools/gn/BUILD.gn

 # Copyright (c) 2013 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.
 
 import("//testing/test.gni")
 
 defines = [ "GN_BUILD" ]
 
 static_library("gn_lib") {
   configs += [ "//build/config:precompiled_headers" ]
@@ skipping 120 matching lines @@
     "ninja_toolchain_writer.cc",
     "ninja_toolchain_writer.h",
     "ninja_utils.cc",
     "ninja_utils.h",
     "ninja_writer.cc",
     "ninja_writer.h",
     "operators.cc",
     "operators.h",
     "output_file.cc",
     "output_file.h",
+    "parse_node_value_adapter.cc",
+    "parse_node_value_adapter.h",
     "parse_tree.cc",
     "parse_tree.h",
     "parser.cc",
     "parser.h",
     "path_output.cc",
     "path_output.h",
     "pattern.cc",
     "pattern.h",
     "pool.cc",
     "pool.h",
@@ skipping 179 matching lines @@
     "format_test_data/",
   ]
 
   deps = [
     ":gn_lib",
     "//base/test:run_all_unittests",
     "//base/test:test_support",
     "//testing/gtest",
   ]
 }