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

runtime/observatory/BUILD.gn

 # Copyright 2015 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("../../build/executable_suffix.gni")
 import("../../build/prebuilt_dart_sdk.gni")
 import("../../build/dart_host_toolchain.gni")
+import("observatory_sources.gni")
 
 # Construct arguments to the observatory tool for finding pub.
 pub_build_deps = []
 pub_build_args = []
 if (!prebuilt_dart_exe_works) {
   pub_build_deps += [ "../bin:dart_bootstrap($dart_host_toolchain)" ]
 
   dart_out_dir = get_label_info("../bin:dart_bootstrap($dart_host_toolchain)",
                                 "root_out_dir")
   dart_bootstrap = rebase_path("$dart_out_dir/dart_bootstrap$executable_suffix")
 
   pub_build_args = [
     "--sdk=True",
     "--dart-executable",
     dart_bootstrap,
   ]
 } else {
   pub_build_args = [ "--sdk=True" ]
 }
 
 current_dir = rebase_path(".", "//")
 
 # Helper build rules for packaging the Dart observatory resources.
-observatory_sources_gypi =
-    exec_script("../../tools/gypi_to_gn.py",
-                [ rebase_path("../observatory/observatory_sources.gypi") ],
-                "scope",
-                [ "../observatory/observatory_sources.gypi" ])
-
 copy("copy_observatory") {
-  sources = rebase_path(observatory_sources_gypi.sources, "", ".")
+  sources = rebase_path(observatory_sources, "", ".")
   outputs = [
     "$root_gen_dir/observatory_copy/{{source_root_relative_dir}}/{{source_file_part}}",
   ]
 }
 
 action("write_observatory_pubspec_yaml") {
   deps = [ ":copy_observatory" ] + pub_build_deps
 
   inputs = [
     rebase_path("pubspec.yaml"),
@@ skipping 41 matching lines @@
     "$root_gen_dir/observatory_copy/$current_dir/packages.stamp",
   ]
 }
 
 action("pub_build_observatory") {
   deps = [
            ":copy_observatory",
            ":copy_observatory_deps",
          ] + pub_build_deps
 
-  sources = rebase_path(observatory_sources_gypi.sources,
+  sources = rebase_path(observatory_sources,
                         "",
                         "$root_gen_dir/observatory_copy/$current_dir")
 
   inputs =
       sources + [ "$root_gen_dir/observatory_copy/$current_dir/packages.stamp" ]
 
   script = "../../tools/observatory_tool.py"
   args = pub_build_args + [
            "--silent=True",
            "--directory",
@@ skipping 102 matching lines @@
 
 source_set("standalone_observatory_archive") {
   deps = [
     ":standalone_archive_observatory",
   ]
 
   sources = [
     rebase_path("$root_gen_dir/observatory/standalone_archive_observatory.cc"),
   ]
 }