Begin migrating the vm service from a rest-style interface to a json-rpc style interface.

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"
@@ skipping 16 matching lines @@
 class JSONStream : ValueObject {
  public:
   explicit JSONStream(intptr_t buf_size = 256);
   ~JSONStream();
 
   void Setup(Zone* zone,
              Dart_Port reply_port,
              const GrowableObjectArray& path,
              const Array& option_keys,
              const Array& option_values);
+
+  void SetupNew(Zone* zone,
+                Dart_Port reply_port,
+                const String& method,
+                const Array& param_keys,
+                const Array& param_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);
   void SetOptions(const char** option_keys, const char** option_values,
                   intptr_t num_options);
 
   Dart_Port reply_port() const { return reply_port_; }
 
   intptr_t num_arguments() const { return num_arguments_; }
   const char* GetArgument(intptr_t i) const {
     return arguments_[i];
   }
+
+  // TODO(turnidge): Rename "options" to "params".  That is the more
+  // appropriate name for json rpc.
   intptr_t num_options() const { return num_options_; }
   const char* GetOptionKey(intptr_t i) const {
     return option_keys_[i];
   }
   const char* GetOptionValue(intptr_t i) const {
     return option_values_[i];
   }
 
   const char* LookupOption(const char* key) const;
 
   bool HasOption(const char* key) const;
 
   // Returns true if there is an option with key and value, false
   // otherwise.
   bool OptionIs(const char* key, const char* value) const;
 
+  // TODO(turnidge): Rename "command" to "method".  Better name for json rpc.
   const char* command() const { return command_; }
   const char** arguments() const { return arguments_; }
   const char** option_keys() const { return option_keys_; }
   const char** option_values() const { return option_values_; }
 
  private:
   void Clear();
 
   void OpenObject(const char* property_name = NULL);
   void CloseObject();
@@ skipping 164 matching lines @@
 
   friend class JSONObject;
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(JSONArray);
 };
 
 }  // namespace dart
 
 #endif  // VM_JSON_STREAM_H_