isolates refactor: this change introduces 'dart:isolate' as a library. This is a

utils/dartdoc/dartdoc.dart

 // Copyright (c) 2011, 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.
 
 /**
  * To use it, from this directory, run:
  *
  *     $ ./dartdoc <path to .dart file>
  *
  * This will create a "docs" directory with the docs for your libraries. To
@@ skipping 170 matching lines @@
     var oldDietParse = options.dietParse;
     try {
       options.dietParse = true;
 
       // Handle the built-in entrypoints.
       switch (entrypoint) {
         case 'corelib':
           world.getOrAddLibrary('dart:core');
           world.getOrAddLibrary('dart:coreimpl');
           world.getOrAddLibrary('dart:json');
+          world.getOrAddLibrary('dart:isolate');
           world.process();
           break;
 
         case 'dom':
           world.getOrAddLibrary('dart:core');
           world.getOrAddLibrary('dart:coreimpl');
           world.getOrAddLibrary('dart:json');
           world.getOrAddLibrary('dart:dom');
+          world.getOrAddLibrary('dart:isolate');
           world.process();
           break;
 
         case 'html':
           world.getOrAddLibrary('dart:core');
           world.getOrAddLibrary('dart:coreimpl');
           world.getOrAddLibrary('dart:json');
           world.getOrAddLibrary('dart:dom');
           world.getOrAddLibrary('dart:html');
+          world.getOrAddLibrary('dart:isolate');
           world.process();
           break;
 
         default:
           // Normal entrypoint script.
           world.processDartScript(entrypoint);
       }
 
       world.resolveAll();
 
@@ skipping 988 matching lines @@
 
     return new md.Element.text('code', name);
   }
 
   // TODO(rnystrom): Move into SourceSpan?
   int getSpanColumn(SourceSpan span) {
     final line = span.file.getLine(span.start);
     return span.file.getColumn(line, span.start);
   }
 }