Add package config support to dart:isolate

runtime/bin/io_impl_sources.gypi

 # Copyright (c) 2012, 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.
 
 # This file contains some C++ sources for the dart:io library.  The other
 # implementation files are in builtin_impl_sources.gypi.
 {
   'sources': [
     'eventhandler.cc',
     'eventhandler.h',
     'eventhandler_android.cc',
+    'eventhandler_android.h',
     'eventhandler_linux.cc',
     'eventhandler_linux.h',
     'eventhandler_macos.cc',
     'eventhandler_macos.h',
     'eventhandler_win.cc',
     'eventhandler_win.h',
     'file_system_watcher.cc',
     'file_system_watcher.h',
     'file_system_watcher_android.cc',
     'file_system_watcher_linux.cc',
@@ skipping 19 matching lines @@
     'process_linux.cc',
     'process_macos.cc',
     'process_win.cc',
     '../../third_party/root_certificates/root_certificates.cc',
     'secure_socket.cc',
     'secure_socket.h',
     'secure_socket_unsupported.cc',
     'socket.cc',
     'socket.h',
     'socket_android.cc',
+    'socket_android.h',
     'socket_linux.cc',
+    'socket_linux.h',
     'socket_macos.cc',
+    'socket_macos.h',
     'socket_win.cc',
+    'socket_win.h',
     'stdio.cc',
     'stdio.h',
     'stdio_android.cc',
     'stdio_linux.cc',
     'stdio_macos.cc',
     'stdio_win.cc',
   ],
   'conditions': [
     ['dart_io_support==1', {
       'conditions': [
@@ skipping 25 matching lines @@
         'io_service.h',
         'io_service_no_ssl.cc',
         'io_service_no_ssl.h',
         '../../third_party/root_certificates/root_certificates.cc',
         'secure_socket.cc',
         'secure_socket.h',
       ],
     }],
   ],
 }