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

runtime/bin/vmservice/server.dart

 // 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.
 
 part of vmservice_io;
 
 class WebSocketClient extends Client {
   static const int PARSE_ERROR_CODE = 4000;
   static const int BINARY_MESSAGE_ERROR_CODE = 4001;
   static const int NOT_MAP_ERROR_CODE = 4002;
@@ skipping 12 matching lines @@
       try {
         map = JSON.decode(message);
       } catch (e) {
         socket.close(PARSE_ERROR_CODE, 'Message parse error: $e');
         return;
       }
       if (map is! Map) {
         socket.close(NOT_MAP_ERROR_CODE, 'Message must be a JSON map.');
         return;
       }
-      var seq = map['seq'];
-      onMessage(seq, new Message.fromUri(Uri.parse(map['request'])));
+      var serial = map['id'];
+
+      // If the map contains 'params' then this is a JsonRPC message.
+      // We are currently in the process of switching the vmservice over to
+      // JsonRPC.
+      if (map['params'] != null) {
+        onMessage(serial, new Message.fromJsonRpc(map['method'],
+                                                  map['params']));
+      } else {
+        onMessage(serial, new Message.fromUri(Uri.parse(map['method'])));
+      }
     } else {
       socket.close(BINARY_MESSAGE_ERROR_CODE, 'Message must be a string.');
     }
   }
 
-  void post(var seq, dynamic response) {
+  void post(var serial, dynamic response) {
     try {
       Map map = {
-        'seq': seq,
+        'id': serial,
         'response': response
       };
-      if (seq == null && response is! String) {
+      if (serial == null && response is! String) {
         socket.add(response);
       } else {
         socket.add(JSON.encode(map));
       }
     } catch (_) {
       print("Ignoring error posting over WebSocket.");
     }
   }
 
   dynamic toJson() {
     Map map = super.toJson();
     map['type'] = 'WebSocketClient';
     map['socket'] = '$socket';
     return map;
   }
 }
 
 
 class HttpRequestClient extends Client {
   static ContentType jsonContentType =
       new ContentType("application", "json", charset: "utf-8");
   final HttpRequest request;
 
   HttpRequestClient(this.request, service) : super(service);
 
-  void post(var seq, String response) {
+  void post(var serial, String response) {
     request.response..headers.contentType = jsonContentType
                     ..write(response)
                     ..close();
     close();
   }
 
   dynamic toJson() {
     Map map = super.toJson();
     map['type'] = 'HttpRequestClient';
     map['request'] = '$request';
@@ skipping 121 matching lines @@
       print('Could not shutdown Observatory HTTP server:\n$e\n$st\n');
       _notifyServerState("", 0);
       return this;
     });
   }
 
 }
 
 void _notifyServerState(String ip, int port)
     native "VMServiceIO_NotifyServerState";