Prioritize analysis operations for contexts with priority files.

pkg/analysis_server/test/mocks.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 mocks;
 
 @MirrorsUsed(targets: 'mocks', override: '*')
 import 'dart:mirrors';
 import 'dart:async';
 import 'dart:io';
@@ skipping 305 matching lines @@
 
   MockServerOperation(this.priority, this._perform);
 
   @override
   AnalysisContext get context => null;
 
   @override
   bool get isContinue => false;
 
   @override
-  bool get isPriority => null;
-
-  @override
   void perform(AnalysisServer server) => this._perform(server);
 }
 
 
 /**
  * A mock [WebSocket] for testing.
  */
 class MockSocket<T> implements WebSocket {
   StreamController controller = new StreamController();
   MockSocket twin;
@@ skipping 162 matching lines @@
     }
     return mismatchDescription;
   }
 
   @override
   bool matches(item, Map matchState) {
     Response response = item;
     return response != null && response.id == _id && response.error == null;
   }
 }