Report iOS as iOS rather than OS X.

runtime/bin/platform_macos.cc

 // 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.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_MACOS)
 
 #include <mach-o/dyld.h>
 #include <sys/types.h>
 #include <sys/sysctl.h>
@@ skipping 35 matching lines @@
   if (sysctlbyname("hw.logicalcpu", &cpus, &cpus_length, NULL, 0) == 0) {
     return cpus;
   } else {
     // Failed, fallback to using sysconf.
     return sysconf(_SC_NPROCESSORS_ONLN);
   }
 }
 
 
 const char* Platform::OperatingSystem() {
+#if TARGET_OS_IOS
+  return "ios";
+#else
   return "macos";
+#endif
 }
 
 
 const char* Platform::LibraryExtension() {
   return "dylib";
 }
 
 
 bool Platform::LocalHostname(char *buffer, intptr_t buffer_length) {
   return gethostname(buffer, buffer_length) == 0;
@@ skipping 54 matching lines @@
 }
 
 void Platform::Exit(int exit_code) {
   exit(exit_code);
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_MACOS)