Split dart:builtin into dart:builtin and dart:io.

runtime/bin/builtin_sources.gypi

Index: runtime/bin/builtin_sources.gypi
diff --git a/runtime/bin/builtin_sources.gypi b/runtime/bin/builtin_sources.gypi
index 8147e83ecfa9cbd68289a834d27a8085378e7d9c..cbfd1f067618ee5258052a133bd15754d2edfc32 100644
--- a/runtime/bin/builtin_sources.gypi
+++ b/runtime/bin/builtin_sources.gypi
@@ -2,89 +2,9 @@
 # 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 all sources (vm and tests) for the dart virtual machine.
-# Unit test files need to have a '_test' suffix appended to the name.
+# This file contains all dart sources for the dart:builtin library.
 {
   'sources': [
-    #
-    # Dart sources.
-    #
     'builtin.dart',
-    'buffer_list.dart',
-    'chunked_stream.dart',
-    'directory.dart',
-    'directory_impl.dart',
-    'eventhandler.dart',
-    'file.dart',
-    'file_impl.dart',
-    'input_stream.dart',
-    'list_stream.dart',
-    'output_stream.dart',
-    'stream_util.dart',
-    'string_stream.dart',
-    'platform.dart',
-    'platform_impl.dart',
-    'process.dart',
-    'process_impl.dart',
-    'socket.dart',
-    'socket_impl.dart',
-    'socket_stream.dart',
-    'timer.dart',
-    'timer_impl.dart',
-    #
-    # C++ sources.
-    #
-    'dartutils.cc',
-    'dartutils.h',
-    'directory.cc',
-    'directory.h',
-    'directory_posix.cc',
-    'directory_win.cc',
-    'eventhandler.cc',
-    'eventhandler.h',
-    'eventhandler_linux.cc',
-    'eventhandler_linux.h',
-    'eventhandler_macos.cc',
-    'eventhandler_macos.h',
-    'eventhandler_win.cc',
-    'eventhandler_win.h',
-    'file.cc',
-    'file.h',
-    'file_linux.cc',
-    'file_macos.cc',
-    'file_win.cc',
-    'file_test.cc',
-    'fdutils.h',
-    'fdutils_linux.cc',
-    'fdutils_macos.cc',
-    'hashmap.cc',
-    'hashmap.h',
-    'hashmap_test.cc',
-    'platform.cc',
-    'platform.h',
-    'platform_linux.cc',
-    'platform_macos.cc',
-    'platform_win.cc',
-    'process.cc',
-    'process.h',
-    'process_linux.cc',
-    'process_macos.cc',
-    'process_win.cc',
-    'socket.cc',
-    'socket.h',
-    'socket_linux.cc',
-    'socket_macos.cc',
-    'socket_win.cc',
-    'set.h',
-    'set_test.cc',
-    'thread.h',
-    'thread_pool.cc',
-    'thread_pool_linux.cc',
-    'thread_pool_linux.h',
-    'thread_pool_macos.cc',
-    'thread_pool_macos.h',
-    'thread_pool_test.cc',
-    'thread_pool_win.cc',
-    'thread_pool_win.h',
   ],
 }