Implement SearchEngine for the new driver.

pkg/analysis_server/lib/src/search/search_domain.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 search.domain;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/constants.dart';
@@ skipping 31 matching lines @@
 
   /**
    * Initialize a newly created handler to handle requests for the given [server].
    */
   SearchDomainHandler(AnalysisServer server)
       : server = server,
         index = server.index,
         searchEngine = server.searchEngine;
 
   Future findElementReferences(protocol.Request request) async {
-    if (server.options.enableNewAnalysisDriver) {
-      // TODO(scheglov) implement for the new analysis driver
-      String searchId = (_nextSearchId++).toString();
-      var result = new protocol.SearchFindElementReferencesResult();
-      result.id = searchId;
-      _sendSearchResult(request, result);
-      _sendSearchNotification(searchId, true, <protocol.SearchResult>[]);
-      return;
-    }
     var params =
         new protocol.SearchFindElementReferencesParams.fromRequest(request);
     String file = params.file;
-    await server.onAnalysisComplete;
     // prepare element
+    if (!server.options.enableNewAnalysisDriver) {
+      await server.onAnalysisComplete;
+    }
     Element element = await server.getElementAtOffset(file, params.offset);
     if (element is ImportElement) {
       element = (element as ImportElement).prefix;
     }
     if (element is FieldFormalParameterElement) {
       element = (element as FieldFormalParameterElement).field;
     }
     if (element is PropertyAccessorElement) {
       element = (element as PropertyAccessorElement).variable;
     }
@@ skipping 160 matching lines @@
   void _sendTypeHierarchyNull(protocol.Request request) {
     protocol.Response response =
         new protocol.SearchGetTypeHierarchyResult().toResponse(request.id);
     server.sendResponse(response);
   }
 
   static protocol.SearchResult toResult(SearchMatch match) {
     return protocol.newSearchResult_fromMatch(match);
   }
 }