hook new DartCompletionContributor API into existing framework

pkg/analysis_server/test/services/completion/dart/completion_contributor_util.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.services.completion.dart.util;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart' as protocol
     show Element, ElementKind;
 import 'package:analysis_server/plugin/protocol/protocol.dart'
     hide Element, ElementKind;
 import 'package:analysis_server/plugin/protocol/protocol.dart';
-import 'package:analysis_server/src/provisional/completion/completion_core.dart'
-    show AnalysisRequest, CompletionContributor, CompletionRequest;
 import 'package:analysis_server/src/provisional/completion/completion_dart.dart';
-import 'package:analysis_server/src/services/completion/completion_dart.dart'
+import 'package:analysis_server/src/services/completion/completion_core.dart';
+import 'package:analysis_server/src/services/completion/dart/completion_manager.dart'
     show DartCompletionRequestImpl;
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart'
     show DART_RELEVANCE_DEFAULT, DART_RELEVANCE_LOW;
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/index/local_memory_index.dart';
 import 'package:analysis_server/src/services/search/search_engine_internal.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../../abstract_context.dart';
-import 'package:analysis_server/src/services/completion/completion_core.dart';
 
 int suggestionComparator(CompletionSuggestion s1, CompletionSuggestion s2) {
   String c1 = s1.completion.toLowerCase();
   String c2 = s2.completion.toLowerCase();
   return c1.compareTo(c2);
 }
 
 abstract class DartCompletionContributorTest extends AbstractContextTest {
   Index index;
   SearchEngineImpl searchEngine;
   String testFile = '/completionTest.dart';
   Source testSource;
   int completionOffset;
   DartCompletionContributor contributor;
-  CompletionRequest request;
+  DartCompletionRequest request;
   List<CompletionSuggestion> suggestions;
 
   void addTestSource(String content) {
     expect(completionOffset, isNull, reason: 'Call addTestUnit exactly once');
     completionOffset = content.indexOf('^');
     expect(completionOffset, isNot(equals(-1)), reason: 'missing ^');
     int nextOffset = content.indexOf('^', completionOffset + 1);
     expect(nextOffset, equals(-1), reason: 'too many ^');
     content = content.substring(0, completionOffset) +
         content.substring(completionOffset + 1);
@@ skipping 157 matching lines @@
   }
 
   @override
   void setUp() {
     super.setUp();
     index = createLocalMemoryIndex();
     searchEngine = new SearchEngineImpl(index);
     contributor = createContributor();
   }
 }