Move the wire protocol support into the public API

pkg/analysis_server/test/services/completion/completion_computer_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.services.completion.suggestion;
 
 import 'dart:async';
 
+import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/analysis_server.dart';
-import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/provisional/completion/completion_core.dart'
     show CompletionRequest, CompletionResult;
 import 'package:analysis_server/src/services/completion/completion_manager.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
 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.dart';
 import 'package:analysis_server/src/services/search/search_engine_internal.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
@@ skipping 144 matching lines @@
 
 class MockCompletionContributor extends DartCompletionContributor {
   final CompletionSuggestion fastSuggestion;
   final CompletionSuggestion fullSuggestion;
   int fastCount = 0;
   int fullCount = 0;
   DartCompletionRequest request;
 
   MockCompletionContributor(this.fastSuggestion, this.fullSuggestion);
 
-  assertCalls(AnalysisContext context, Source source, int offset, SearchEngine searchEngine) {
+  assertCalls(AnalysisContext context, Source source, int offset,
+      SearchEngine searchEngine) {
     expect(request.context, equals(context));
     expect(request.source, equals(source));
     expect(request.offset, equals(offset));
     expect(request.searchEngine, equals(searchEngine));
   }
 
   assertFull(int fullCount) {
     expect(this.fastCount, equals(1));
     expect(this.fullCount, equals(fullCount));
   }
@@ skipping 11 matching lines @@
   @override
   Future<bool> computeFull(DartCompletionRequest request) {
     this.request = request;
     fullCount++;
     if (fullSuggestion != null) {
       request.addSuggestion(fullSuggestion);
     }
     return new Future.value(fullSuggestion != null);
   }
 }