Add dart:developer.postEvent for posting events to the service protocol from Dart code

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/text_buffer.h"
 #include "vm/allocation.h"
@@ skipping 108 matching lines @@
     count_ = value;
   }
 
   void ComputeOffsetAndCount(intptr_t length,
                              intptr_t* offset,
                              intptr_t* count);
 
   // Append |serialized_object| to the stream.
   void AppendSerializedObject(const char* serialized_object);
 
+  // Append |serialized_object| to the stream with |property_name|.
+  void AppendSerializedObject(const char* property_name,
+                              const char* serialized_object);
+
  private:
   void Clear();
   void PostNullReply(Dart_Port port);
 
   void OpenObject(const char* property_name = NULL);
   void CloseObject();
 
   void OpenArray(const char* property_name = NULL);
   void CloseArray();
 
@@ skipping 233 matching lines @@
 
   friend class JSONObject;
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(JSONArray);
 };
 
 }  // namespace dart
 
 #endif  // VM_JSON_STREAM_H_