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

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

Index: compiler/java/com/google/dart/compiler/SystemLibraryManager.java
diff --git a/compiler/java/com/google/dart/compiler/SystemLibraryManager.java b/compiler/java/com/google/dart/compiler/SystemLibraryManager.java
index ece804d736b0519a3ba3a8cc1ef0b4a2cb314039..b573e323de27c207b7de243da3f75287cd1d9bdf 100644
--- a/compiler/java/com/google/dart/compiler/SystemLibraryManager.java
+++ b/compiler/java/com/google/dart/compiler/SystemLibraryManager.java
@@ -26,7 +26,8 @@ public class SystemLibraryManager {
     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;