Fuchsia: Build an OS image that includes Dart's test suite.

tools/testing/dart/test_suite.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.
 
 /**
  * Classes and methods for enumerating and preparing tests.
  *
  * This library includes:
  *
  * - Creating tests by listing all the Dart files in certain directories,
@@ skipping 2284 matching lines @@
   static Path absolutePath(Path path) {
     if (!path.isAbsolute) {
       return currentWorkingDirectory.join(path);
     }
     return path;
   }
 
   static String outputDir(Map configuration) {
     var result = '';
     var system = configuration['system'];
-    if (system == 'linux' || system == 'android' || system == 'windows') {
+    if (system == 'fuchsia' ||
+        system == 'linux' ||
+        system == 'android' ||
+        system == 'windows') {
       result = 'out/';
     } else if (system == 'macos') {
       result = 'xcodebuild/';
     } else {
       throw new Exception('Unknown operating system: "$system"');
     }
     return result;
   }
 
   static List<String> standardOptions(Map configuration) {
@@ skipping 89 matching lines @@
         mode = 'Product';
         break;
       default:
         throw 'Unrecognized mode configuration: ${configuration['mode']}';
     }
     var os;
     switch (configuration['system']) {
       case 'android':
         os = 'Android';
         break;
+      case 'fuchsia':
       case 'linux':
       case 'macos':
       case 'windows':
         os = '';
         break;
       default:
         throw 'Unrecognized operating system: ${configuration['system']}';
     }
     var arch = configuration['arch'].toUpperCase();
     var normal = '$mode$os$arch';
@@ skipping 105 matching lines @@
       }
       if (path.length > WINDOWS_SHORTEN_PATH_LIMIT) {
         ++shortNameCounter;
         var pathEnd = path.substring(path.length - WINDOWS_PATH_END_LENGTH);
         path = "short${shortNameCounter}_$pathEnd";
       }
     }
     return path;
   }
 }