new onPriorityChanged event stream

pkg/analysis_server/test/protocol_test.dart

 // Copyright (c) 2014, 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 test.protocol;
 
 import 'dart:convert';
 
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol.dart';
@@ skipping 206 matching lines @@
       Response.ID: '',
       Response.ERROR: {
         'code': 'INVALID_REQUEST',
         'message': 'Invalid request'
       }
     }));
   }
 
   void test_create_unanalyzedPriorityFiles() {
     Response response =
-        new Response.unanalyzedPriorityFiles(new Request('0', ''), 'file list');
+        new Response.unanalyzedPriorityFiles('0', 'file list');
     expect(response.id, equals('0'));
     expect(response.error, isNotNull);
     expect(response.toJson(), equals({
       Response.ID: '0',
       Response.ERROR: {
         'code': 'UNANALYZED_PRIORITY_FILES',
         'message': "Unanalyzed files cannot be a priority: 'file list'"
       }
     }));
   }
@@ skipping 31 matching lines @@
     Response original = new Response('myId', result: {
       'foo': 'bar'
     });
     Response response = new Response.fromJson(original.toJson());
     expect(response.id, equals('myId'));
     Map<String, Object> result = response.toJson()['result'];
     expect(result.length, equals(1));
     expect(result['foo'], equals('bar'));
   }
 }