Report iOS as iOS rather than OS X.

sdk/lib/io/platform.dart

 // 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.
 
 part of dart.io;
 
 /**
  * Information about the environment in which the current program is running.
  *
  * Platform provides information such as the operating system,
@@ skipping 66 matching lines @@
    */
   static int get numberOfProcessors => _numberOfProcessors;
 
   /**
    * Get the path separator used by the operating system to separate
    * components in file paths.
    */
   static String get pathSeparator => _pathSeparator;
 
   /**
-   * Get a string (`linux`, `macos`, `windows` or `android`)
+   * Get a string (`linux`, `macos`, `windows`, `android`, or `ios`)
    * representing the operating system.
    */
   static String get operatingSystem => _operatingSystem;
 
   /**
    * Get the local hostname for the system.
    */
   static String get localHostname => _localHostname;
 
   /**
@@ skipping 10 matching lines @@
    * Returns true if the operating system is Windows.
    */
   static final bool isWindows = (_operatingSystem == "windows");
 
   /**
    * Returns true if the operating system is Android.
    */
   static final bool isAndroid = (_operatingSystem == "android");
 
   /**
+   * Returns true if the operating system is iOS.
+   */
+  static final bool isiOS = (_operatingSystem == "ios");
+
+  /**
    * Get the environment for this process.
    *
    * The returned environment is an unmodifiable map which content is
    * retrieved from the operating system on its first use.
    *
    * Environment variables on Windows are case-insensitive. The map
    * returned on Windows is therefore case-insensitive and will convert
    * all keys to upper case. On other platforms the returned map is
    * a standard case-sensitive map.
    */
@@ skipping 59 matching lines @@
   /**
    * Returns the version of the current Dart runtime.
    *
    * The returned `String` is formatted as the
    * [semver](http://semver.org) version string of the current dart
    * runtime, possibly followed by whitespace and other version and
    * build details.
    */
   static String get version => _version;
 }