Port async file operations to be using native ports instead or an isolate

runtime/bin/dartutils.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/dartutils.h"
 
 #include "bin/file.h"
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/globals.h"
@@ skipping 304 matching lines @@
 }
 
 
 Dart_CObject* CObject::NewInt64(int64_t value) {
   Dart_CObject* cobject = New(Dart_CObject::kInt64);
   cobject->value.as_int64 = value;
   return cobject;
 }
 
 
+Dart_CObject* CObject::NewIntptr(intptr_t value) {
+  // Pointer values passed as intptr_t are always send as int64_t.
+  Dart_CObject* cobject = New(Dart_CObject::kInt64);
+  cobject->value.as_int64 = value;
+  return cobject;
+}
+
+
 Dart_CObject* CObject::NewDouble(double value) {
   Dart_CObject* cobject = New(Dart_CObject::kDouble);
   cobject->value.as_double = value;
   return cobject;
 }
 
 
 Dart_CObject* CObject::NewString(int length) {
   Dart_CObject* cobject = New(Dart_CObject::kString, length + 1);
   cobject->value.as_string = reinterpret_cast<char*>(cobject + 1);
@@ skipping 10 matching lines @@
 
 
 Dart_CObject* CObject::NewArray(int length) {
   Dart_CObject* cobject =
       New(Dart_CObject::kArray, length * sizeof(Dart_CObject*));  // NOLINT
   cobject->value.as_array.length = length;
   cobject->value.as_array.values =
       reinterpret_cast<Dart_CObject**>(cobject + 1);
   return cobject;
 }
+
+
+Dart_CObject* CObject::NewByteArray(int length) {
+  Dart_CObject* cobject = New(Dart_CObject::kByteArray, length);
+  cobject->value.as_byte_array.length = length;
+  cobject->value.as_byte_array.values = reinterpret_cast<uint8_t*>(cobject + 1);
+  return cobject;
+}