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

compiler/java/com/google/dart/compiler/SystemLibraryManager.java

 // 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.
 
 package com.google.dart.compiler;
 
 import java.io.File;
 import java.io.IOException;
 import java.net.MalformedURLException;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.URL;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.jar.JarFile;
 
 /**
  * Manages the collection of {@link SystemLibrary}s.
  */
 public class SystemLibraryManager {
   private enum SystemLibraryPath {
     CORE("core", "core", "com/google/dart/corelib/", "corelib.dart", "corelib.jar", true), 
     COREIMPL("core", "coreimpl", "com/google/dart/corelib/", "corelib_impl.dart", "corelib.jar",
         CORE, true), 
     DOM("dom", "dom", "dom/", "dom.dart", "domlib.jar"),
     HTML("html", "html", "html/", "html.dart", "htmllib.jar"),
     HTMLIMPL("html", "htmlimpl", "html/", "htmlimpl.dart", "htmllib.jar"),
-    JSON("json", "json", "json/", "json.dart", "jsonlib.jar");
+    JSON("json", "json", "json/", "json.dart", "jsonlib.jar"),
+    ISOLATE("isolate", "isolate", "isolate/", "isolate_compiler.dart", "isolatelib.jar");
 
     final String hostName;
     final SystemLibraryPath base;
     final String shortName;
     final String jar;
     final String lib;
     final boolean failIfMissing;
 
     SystemLibraryPath(String hostName, String shortName, String path, String file, String jar,
         boolean failIfMissing) {
@@ skipping 266 matching lines @@
         if (library != null) {
           defaultLibraries.add(library);
           baseFiles[path.ordinal()] = library.getFile();
         }
       }
     }
 
     return defaultLibraries.toArray(new SystemLibrary[defaultLibraries.size()]);
   }
 }