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

runtime/vm/dart_entry.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/dart_entry.h"
 
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
 #include "vm/object_store.h"
 #include "vm/resolver.h"
@@ skipping 191 matching lines @@
 RawObject* DartLibraryCalls::HandleMessage(Dart_Port dest_port_id,
                                            Dart_Port reply_port_id,
                                            const Instance& message) {
   const String& class_name =
       String::Handle(String::NewSymbol("ReceivePortImpl"));
   const String& function_name =
       String::Handle(String::NewSymbol("_handleMessage"));
   const int kNumArguments = 3;
   const Array& kNoArgumentNames = Array::Handle();
   const Function& function = Function::Handle(
-      Resolver::ResolveStatic(Library::Handle(Library::CoreLibrary()),
+      Resolver::ResolveStatic(Library::Handle(Library::IsolateLibrary()),
                               class_name,
                               function_name,
                               kNumArguments,
                               kNoArgumentNames,
                               Resolver::kIsQualified));
   GrowableArray<const Object*> arguments(kNumArguments);
   arguments.Add(&Integer::Handle(Integer::New(dest_port_id)));
   arguments.Add(&Integer::Handle(Integer::New(reply_port_id)));
   arguments.Add(&message);
   const Object& result = Object::Handle(
       DartEntry::InvokeStatic(function, arguments, kNoArgumentNames));
   ASSERT(result.IsNull() || result.IsError());
   return result.raw();
 }
 
 }  // namespace dart