Use patching for dart:io.

runtime/bin/bin.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.
 
 {
   'variables': {
     'crypto_cc_file': '<(SHARED_INTERMEDIATE_DIR)/crypto_gen.cc',
     'io_cc_file': '<(SHARED_INTERMEDIATE_DIR)/io_gen.cc',
+    'io_patch_cc_file': '<(SHARED_INTERMEDIATE_DIR)/io_patch_gen.cc',
     'json_cc_file': '<(SHARED_INTERMEDIATE_DIR)/json_gen.cc',
     'uri_cc_file': '<(SHARED_INTERMEDIATE_DIR)/uri_gen.cc',
     'utf_cc_file': '<(SHARED_INTERMEDIATE_DIR)/utf_gen.cc',
     'builtin_in_cc_file': 'builtin_in.cc',
     'builtin_cc_file': '<(SHARED_INTERMEDIATE_DIR)/builtin_gen.cc',
     'snapshot_in_cc_file': 'snapshot_in.cc',
     'snapshot_bin_file': '<(SHARED_INTERMEDIATE_DIR)/snapshot_gen.bin',
     'snapshot_cc_file': '<(SHARED_INTERMEDIATE_DIR)/snapshot_gen.cc',
   },
   'targets': [
@@ skipping 53 matching lines @@
             '--var_name', 'Builtin::crypto_source_',
             '<@(_sources)',
           ],
           'message': 'Generating ''<(crypto_cc_file)'' file.'
         },
       ]
     },
     {
       'target_name': 'generate_io_cc_file',
       'type': 'none',
+      'sources': [
+        'io.dart',
+      ],
       'includes': [
-        'io_sources.gypi',
+        '../../lib/io/iolib_sources.gypi',
       ],
       'actions': [
         {
           'action_name': 'generate_io_cc',
           'inputs': [
             '../tools/create_string_literal.py',
             '<(builtin_in_cc_file)',
             '<@(_sources)',
           ],
           'outputs': [
             '<(io_cc_file)',
           ],
           'action': [
             'python',
             'tools/create_string_literal.py',
             '--output', '<(io_cc_file)',
             '--input_cc', '<(builtin_in_cc_file)',
             '--include', 'bin/builtin.h',
             '--var_name', 'Builtin::io_source_',
             '<@(_sources)',
           ],
           'message': 'Generating ''<(io_cc_file)'' file.'
         },
       ]
     },
     {
+      'target_name': 'generate_io_patch_cc_file',
+      'type': 'none',
+      'includes': [
+        'io_sources.gypi',
+      ],
+      'actions': [
+        {
+          'action_name': 'generate_io_patch_cc',
+          'inputs': [
+            '../tools/create_string_literal.py',
+            '<(builtin_in_cc_file)',
+            '<@(_sources)',
+          ],
+          'outputs': [
+            '<(io_patch_cc_file)',
+          ],
+          'action': [
+            'python',
+            'tools/create_string_literal.py',
+            '--output', '<(io_patch_cc_file)',
+            '--input_cc', '<(builtin_in_cc_file)',
+            '--include', 'bin/builtin.h',
+            '--var_name', 'Builtin::io_patch_',
+            '<@(_sources)',
+          ],
+          'message': 'Generating ''<(io_patch_cc_file)'' file.'
+        },
+      ]
+    },
+    {
       'target_name': 'generate_json_cc_file',
       'type': 'none',
       'includes': [
         'json_sources.gypi',
       ],
       'actions': [
         {
           'action_name': 'generate_json_cc',
           'inputs': [
             '../tools/create_string_literal.py',
@@ skipping 95 matching lines @@
         },
       ]
     },
     {
       'target_name': 'libdart_builtin',
       'type': 'static_library',
       'dependencies': [
         'generate_builtin_cc_file',
         'generate_crypto_cc_file',
         'generate_io_cc_file',
+        'generate_io_patch_cc_file',
         'generate_json_cc_file',
         'generate_uri_cc_file',
         'generate_utf_cc_file',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'builtin_natives.cc',
         'builtin.h',
@@ skipping 64 matching lines @@
       'include_dirs': [
         '..',
       ],
       'sources': [
         'gen_snapshot.cc',
         'builtin.cc',
         # Include generated source files.
         '<(builtin_cc_file)',
         '<(crypto_cc_file)',
         '<(io_cc_file)',
+        '<(io_patch_cc_file)',
         '<(json_cc_file)',
         '<(uri_cc_file)',
         '<(utf_cc_file)',
       ],
       'conditions': [
         ['OS=="win"', {
           'link_settings': {
             'libraries': [ '-lws2_32.lib', '-lRpcrt4.lib' ],
           },
        }]],
@@ skipping 99 matching lines @@
       'include_dirs': [
         '..',
       ],
       'sources': [
         'main.cc',
         'builtin.cc',
         # Include generated source files.
         '<(builtin_cc_file)',
         '<(crypto_cc_file)',
         '<(io_cc_file)',
+        '<(io_patch_cc_file)',
         '<(json_cc_file)',
         '<(uri_cc_file)',
         '<(utf_cc_file)',
         'snapshot_empty.cc',
       ],
       'conditions': [
         ['OS=="win"', {
           'link_settings': {
             'libraries': [ '-lws2_32.lib', '-lRpcrt4.lib' ],
           },
@@ skipping 18 matching lines @@
         '..',
         '<(SHARED_INTERMEDIATE_DIR)',
       ],
       'sources': [
         'run_vm_tests.cc',
         'builtin.cc',
         # Include generated source files.
         '<(builtin_cc_file)',
         '<(crypto_cc_file)',
         '<(io_cc_file)',
+        '<(io_patch_cc_file)',
         '<(json_cc_file)',
         '<(uri_cc_file)',
         '<(utf_cc_file)',
       ],
       'includes': [
         'builtin_impl_sources.gypi',
         '../platform/platform_sources.gypi',
         '../vm/vm_sources.gypi',
       ],
       'defines': [
@@ skipping 43 matching lines @@
         ['OS=="mac"', {
           'xcode_settings': {
             'OTHER_LDFLAGS': [ '-undefined', 'dynamic_lookup' ],
           },
         }],
       ],
     },
   ],
 }