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

runtime/vm/bootstrap.cc

 // 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.
 
 #include "vm/bootstrap.h"
 
 #include "include/dart_api.h"
 
 #include "vm/compiler.h"
 #include "vm/dart_api_impl.h"
@@ skipping 20 matching lines @@
                                                  Heap::kOld));
   const String& src = String::Handle(String::New(corelib_impl_source_,
                                                  Heap::kOld));
 
   const Script& result =
       Script::Handle(Script::New(url, src, RawScript::kSource));
   return result.raw();
 }
 
 
+RawScript* Bootstrap::LoadIsolateScript()  {
+  const String& url = String::Handle(String::New("dart:isolate", Heap::kOld));
+  const String& src = String::Handle(String::New(isolate_source_, Heap::kOld));
+
+  const Script& result =
+      Script::Handle(Script::New(url, src, RawScript::kSource));
+  return result.raw();
+}
+
+
 RawError* Bootstrap::Compile(const Library& library, const Script& script) {
   if (FLAG_print_bootstrap) {
     OS::Print("Bootstrap source '%s':\n%s\n",
         String::Handle(script.url()).ToCString(),
         String::Handle(script.source()).ToCString());
   }
   library.SetLoadInProgress();
   const Error& error = Error::Handle(Compiler::Compile(library, script));
   if (error.IsNull()) {
     library.SetLoaded();
+  } else {
+    library.SetLoadError();
   }
   return error.raw();
 }
 
 }  // namespace dart