invoke computeCache when priority sources change

pkg/analysis_server/lib/src/services/completion/dart_completion_manager.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 services.completion.dart;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/completion/arglist_computer.dart';
@@ skipping 63 matching lines @@
         newCache = oldCache;
       }
     }
     if (newCache == null) {
       newCache = new DartCompletionCache(context, source);
     }
     return new DartCompletionManager(context, searchEngine, source, newCache);
   }
 
   @override
-  void compute(CompletionRequest completionRequest) {
+  void computeSuggestions(CompletionRequest completionRequest) {
     DartCompletionRequest request = new DartCompletionRequest(
         context,
         searchEngine,
         source,
         completionRequest.offset,
         cache,
         completionRequest.performance);
     request.performance.logElapseTime('compute', () {
       computeFast(request);
       if (!computers.isEmpty) {
@@ skipping 164 matching lines @@
   _ReplacementOffsetBuilder(this.request) {
     request.replacementOffset = request.offset;
     request.replacementLength = 0;
   }
 
   visitSimpleIdentifier(SimpleIdentifier node) {
     request.replacementOffset = node.offset;
     request.replacementLength = node.length;
   }
 }