Fix for Directory.exists on Windows using GetFileAttributes

runtime/bin/directory.cc

 // Copyright (c) 2012, 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 "bin/directory.h"
 
 #include "bin/dartutils.h"
 #include "bin/thread.h"
 #include "include/dart_api.h"
 #include "platform/assert.h"
@@ skipping 280 matching lines @@
 
 CObjectArray* DirectoryListing::NewResponse(Response type, char* arg) {
   CObjectArray* response = new CObjectArray(CObject::NewArray(2));
   response->SetAt(0, new CObjectInt32(CObject::NewInt32(type)));
   response->SetAt(1, new CObjectString(CObject::NewString(arg)));
   return response;
 }
 
 
 bool DirectoryListing::HandleDirectory(char* dir_name) {
-  // TODO(sgjesse): Pass flags to indicate whether directory
-  // responses are needed.
   CObjectArray* response = NewResponse(kListDirectory, dir_name);
   return Dart_PostCObject(response_port_, response->AsApiCObject());
 }
 
 
 bool DirectoryListing::HandleFile(char* file_name) {
-  // TODO(sgjesse): Pass flags to indicate whether file
-  // responses are needed.
   CObjectArray* response = NewResponse(kListFile, file_name);
   return Dart_PostCObject(response_port_, response->AsApiCObject());
 }
 
 
 bool DirectoryListing::HandleError(const char* dir_name) {
-  // TODO(sgjesse): Pass flags to indicate whether error
-  // responses are needed.
   CObject* err = CObject::NewOSError();
   CObjectArray* response = new CObjectArray(CObject::NewArray(3));
   response->SetAt(0, new CObjectInt32(CObject::NewInt32(kListError)));
   response->SetAt(1, new CObjectString(CObject::NewString(dir_name)));
   response->SetAt(2, err);
   return Dart_PostCObject(response_port_, response->AsApiCObject());
 }