[Fuchsia] Implements NetworkInterface.list()

runtime/tests/vm/dart/hello_fuchsia_test.dart

 // Copyright (c) 2016, 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.
 
 import "dart:async";
 import "dart:convert";
 import "dart:io";
 
 testAddressParse() async {
   print(new InternetAddress("1.0.2.3").rawAddress);
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   try {
     dir.openSync();
   } on FileSystemException catch (e) {
     return true;
   } catch (e) {
     print("Unexpected Exception: $e");
     return false;
   }
 }
 
+
+Future testListInterfaces() async {
+  List<NetworkInterface> interfaces = await NetworkInterface.list();
+  print('Found ${interfaces.length} interfaces:');
+  for (var iface in interfaces) {
+    print('\t$iface');
+  }
+}
+
 main(List<String> args) async {
   if (args.length >= 1) {
     if (args[0] == "infinite-loop") {
       while (true);
     }
   }
 
   print("Hello, Fuchsia!");
 
   print("testAddressParse");
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   print("testRecursiveDelete done");
 
   print("testFileOpenDirectoryFails");
   bool result = testFileOpenDirectoryFails();
   if (result) {
     print("testFileOpenDirectoryFails done");
   } else {
     print("testFileOpenDirectoryFails FAILED");
   }
 
+  print('testListInterfaces');
+  await testListInterfaces();
+  print('testListInterfaces done');
+
   print("Goodbyte, Fuchsia!");
 }