Make server use the common protocol classes

pkg/analysis_server/benchmark/integration/input_converter.dart

 // Copyright (c) 2015, 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.
 
 library input.transformer;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
 import 'package:analysis_server/protocol/protocol.dart';
 import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/constants.dart';
+import 'package:analyzer_plugin/protocol/protocol_common.dart';
 import 'package:logging/logging.dart';
 import 'package:path/path.dart' as path;
 
 import 'instrumentation_input_converter.dart';
 import 'log_file_input_converter.dart';
 import 'operation.dart';
 
 /**
  * Common input converter superclass for sharing implementation.
  */
@@ skipping 367 matching lines @@
     if (op != null) {
       outSink.add(op);
     }
   }
 
   @override
   void close() {
     outSink.close();
   }
 }