Landing https://codereview.chromium.org/1171223003/ for Chinmay.

runtime/bin/BUILD.gn

 # Copyright (c) 2014, 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.
 
 
 declare_args() {
   dart_io_support = false
 }
 
 
@@ skipping 190 matching lines @@
     "*secure_socket.cc",
     "*secure_socket.h",
     "*filter_unsupported.cc",
     "*io_service_unsupported.cc",
     "*_test.cc",
     "*_test.h",
     "*dbg*",
     "builtin.cc",
     "builtin_gen_snapshot.cc",
   ]
-  if (!is_mac) {
+  if (!is_mac && !is_ios) {
     # Dart tree uses *_macos.* instead of *_mac.*
     custom_sources_filter += [
       "*_macos.h",
       "*_macos.cc",
     ]
   }
   set_sources_assignment_filter(custom_sources_filter)
 
   defines = [ "DART_IO_SECURE_SOCKET_DISABLED" ]
 
@@ skipping 10 matching lines @@
     "log_macos.cc",
     "log_win.cc",
     "log.h",
   ]
 
   include_dirs = [
     "..",
     "//third_party"
   ]
 }