[dart:io] Adds Platform.operatingSystemVersion

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 51 matching lines @@
  * ## Other resources
  *
  * [Dart by Example](https://www.dartlang.org/dart-by-example/#dart-io-and-command-line-apps)
  * provides additional task-oriented code samples that show how to use
  * various API from the [dart:io] library.
  */
 class Platform {
   static final _numberOfProcessors = _Platform.numberOfProcessors;
   static final _pathSeparator = _Platform.pathSeparator;
   static final _operatingSystem = _Platform.operatingSystem;
+  static final _operatingSystemVersion = _Platform.operatingSystemVersion;
   static final _localHostname = _Platform.localHostname;
   static final _version = _Platform.version;
   static final _localeName = _Platform.localeName;
 
   /**
    * The number of individual execution units of the machine.
    */
   static int get numberOfProcessors => _numberOfProcessors;
 
   /**
    * The path separator used by the operating system to separate
    * components in file paths.
    */
   static String get pathSeparator => _pathSeparator;
 
   /**
    * Get the name of the current locale.
    */
   static String get localeName => _localeName;
 
   /**
    * A string representing the operating system or platform.
    */
   static String get operatingSystem => _operatingSystem;
 
   /**
+   * A string representing the version of the operating system or platform.
+   */
+  static String get operatingSystemVersion => _operatingSystemVersion;
+
+  /**
    * The local hostname for the system.
    */
   static String get localHostname => _localHostname;
 
   /**
    * Whether the operating system is a version of
    * [Linux](https://en.wikipedia.org/wiki/Linux).
    *
    * This value is `false` if the operating system is a specialized
    * version of Linux that identifies itself by a different name,
@@ skipping 113 matching lines @@
   /**
    * The version of the current Dart runtime.
    *
    * The value is a [semantic versioning](http://semver.org)
    * string representing the version of the current Dart runtime,
    * possibly followed by whitespace and other version and
    * build details.
    */
   static String get version => _version;
 }