- Add a minimal implementation of Capability.

runtime/vm/json_stream.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 VM_JSON_STREAM_H_
 #define VM_JSON_STREAM_H_
 
 #include "include/dart_api.h"  // for Dart_Port
 #include "platform/json.h"
 #include "vm/allocation.h"
 
 namespace dart {
 
 class Field;
 class GrowableObjectArray;
 class Instance;
 class JSONArray;
 class JSONObject;
 class Object;
 class SourceBreakpoint;
 class Zone;
 
 class JSONStream : ValueObject {
  public:
   explicit JSONStream(intptr_t buf_size = 256);
   ~JSONStream();
 
   void Setup(Zone* zone,
-             const Instance& reply_port,
+             Dart_Port reply_port,
              const GrowableObjectArray& path,
              const GrowableObjectArray& option_keys,
              const GrowableObjectArray& option_values);
   void PostReply();
 
   TextBuffer* buffer() { return &buffer_; }
   const char* ToCString() { return buffer_.buf(); }
 
   void set_reply_port(Dart_Port port);
   void SetArguments(const char** arguments, intptr_t num_arguments);
@@ skipping 160 matching lines @@
 
   friend class JSONObject;
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(JSONArray);
 };
 
 }  // namespace dart
 
 #endif  // VM_JSON_STREAM_H_