[infra] Translate _sources.gypi files to _sources.gni files

sdk/lib/rules.gni

-# Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
-# for details. All rights reserved. Use of this source code is governed by a
-# BSD-style license that can be found in the LICENSE file.
-
-default_dart_root = rebase_path("../..")
-
-# This build rule will copy the source for one Dart SDK library.
-#
-# Required arguments:
-#   sdk_lib_name
-#       The name of a Dart SDK library.
-#
-# Optional arguments:
-#   destination
-#       Base path to copy sources. Default value is "$root_gen_dir/dart_sdk".
-#
-#   dart_root
-#       Path to the Dart SDK source root. Default value is "../..".
-#
-# The sources will be copied into $root_gen_dir/dart_sdk/$sdk_lib_name/.
-#
-template("dart_sdk_lib_copy") {
-  assert(defined(invoker.sdk_lib_name))
-  if (defined(invoker.dart_root)) {
-    dart_root = rebase_path(invoker.dart_root)
-  } else {
-    dart_root = default_dart_root
-  }
-  if (defined(invoker.destination)) {
-    destination = invoker.destination
-  } else {
-    destination = "$root_gen_dir/dart_sdk"
-  }
-  dart_sdk_sdk_lib_path = rebase_path("sdk/lib", "", dart_root)
-  dart_sdk_tools_gypi_to_gn_path =
-      rebase_path("tools/gypi_to_gn.py", "", dart_root)
-
-  # The name of the SDK library being copied.
-  lib_name = invoker.sdk_lib_name
-
-  # The path to the libraries source directory.
-  lib_path = rebase_path(lib_name, "", dart_sdk_sdk_lib_path)
-
-  # The path to the sources gypi.
-  lib_sources_gypi = lib_name + "_sources.gypi"
-
-  # Get the contents of the gypi file.
-  sdk_lib_sources_gypi =
-      exec_script(dart_sdk_tools_gypi_to_gn_path,
-                  [ rebase_path(lib_sources_gypi, "", lib_path) ],
-                  "scope",
-                  [ rebase_path(lib_sources_gypi, "", lib_path) ])
-  copy(target_name) {
-    sources = rebase_path(sdk_lib_sources_gypi.sources, "", lib_path)
-    outputs = [
-      "$destination/$lib_name/{{source_file_part}}",
-    ]
-  }
-}