- Add a minimal implementation of Capability.

runtime/include/dart_api.h

 /*
  * 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.
  */
 
 #ifndef INCLUDE_DART_API_H_
 #define INCLUDE_DART_API_H_
 
 /** \mainpage Dart Embedding API Reference
@@ skipping 1080 matching lines @@
  * \return True if the message was posted.
  */
 DART_EXPORT bool Dart_Post(Dart_Port port_id, Dart_Handle object);
 
 /**
  * Returns a new SendPort with the provided port id.
  */
 DART_EXPORT Dart_Handle Dart_NewSendPort(Dart_Port port_id);
 
 
-DART_EXPORT Dart_Handle Dart_PortGetId(Dart_Handle port, Dart_Port* port_id);
+DART_EXPORT Dart_Handle Dart_ReceivePortGetId(Dart_Handle port,
+                                              Dart_Port* port_id);
 
 /**
  * Gets the ReceivePort for the provided port id.
  * Returns Dart_Null if a port with the provided port id is not associated with
  * the current isolate.
  *
  * Note that there is at most one ReceivePort for a given port id.
  */
 DART_EXPORT Dart_Handle Dart_GetReceivePort(Dart_Port port_id);
 
@@ skipping 1456 matching lines @@
  * NOTE: If multiple callbacks with the same name are registered, only the
  * last callback registered will be remembered.
  */
 DART_EXPORT void Dart_RegisterRootServiceRequestCallback(
     const char* name,
     Dart_ServiceRequestCallback callback,
     void* user_data);
 
 
 #endif  /* INCLUDE_DART_API_H_ */  /* NOLINT */