GN: Separately track labels and origins for lists of stuff

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.
 
 gyp_file = "gn.gyp"
 
 static_library("gn_lib") {
   sources = [
     "args.cc",
     "args.h",
@@ skipping 56 matching lines @@
     "input_file_manager.cc",
     "input_file_manager.h",
     "item.cc",
     "item.h",
     "item_node.cc",
     "item_node.h",
     "item_tree.cc",
     "item_tree.h",
     "label.cc",
     "label.h",
+    "label_ptr.h",
     "location.cc",
     "location.h",
     "ninja_binary_target_writer.cc",
     "ninja_binary_target_writer.h",
     "ninja_build_writer.cc",
     "ninja_build_writer.h",
     "ninja_copy_target_writer.cc",
     "ninja_copy_target_writer.h",
     "ninja_group_target_writer.cc",
     "ninja_group_target_writer.h",
@@ skipping 108 matching lines @@
     "//base:run_all_unittests",
     "//base:test_support_base",
     "//testing:gtest",
   ]
 }
 
 executable("generate_test_gn_data") {
   sources = [ "generate_test_gn_data.cc" ]
   deps = [ "//base" ]
 }