Merge services into a shared IOService in dart:io, and use a native port.

runtime/bin/native_service.h

-// Copyright (c) 2013, 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.
-
-#ifndef BIN_NATIVE_SERVICE_H_
-#define BIN_NATIVE_SERVICE_H_
-
-#include "include/dart_api.h"
-#include "include/dart_native_api.h"
-#include "platform/globals.h"
-#include "platform/thread.h"
-
-
-namespace dart {
-namespace bin {
-
-// Utility class to set up a native service and allocate Dart native
-// ports to interact with it from Dart code. The number of native ports
-// allocated for each service is limited.
-class NativeService {
- public:
-  // Create a native service with the given name and handler. Allow
-  // the creation of [number_of_ports] native ports for the service.
-  // If GetServicePort is called more than [number_of_ports] times
-  // one of the already allocated native ports will be reused.
-  NativeService(const char* name,
-                Dart_NativeMessageHandler handler,
-                int number_of_ports);
-
-  ~NativeService();
-
-  // Get a Dart native port for this native service.
-  Dart_Port GetServicePort();
-
- private:
-  // Name and handler for the native service.
-  const char* name_;
-  Dart_NativeMessageHandler handler_;
-
-  // Allocated native ports for the service. Mutex protected since
-  // the service can be used from multiple isolates.
-  dart::Mutex mutex_;
-  int service_ports_size_;
-  Dart_Port* service_ports_;
-  int service_ports_index_;
-
-  DISALLOW_IMPLICIT_CONSTRUCTORS(NativeService);
-};
-
-}  // namespace bin
-}  // namespace dart
-
-#endif  // BIN_NATIVE_SERVICE_H_