support part file completions

pkg/analysis_server/lib/src/services/completion/imported_computer.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.computer.dart.toplevel;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analysis_server/src/protocol_server.dart' hide Element,
@@ skipping 75 matching lines @@
   Future<bool> computeFull(AstNode node) {
 
     Future<bool> addSuggestions(_) {
       _addInheritedSuggestions(node);
       _addTopLevelSuggestions();
       return new Future.value(true);
     }
 
     Future future = null;
     if (!cache.isImportInfoCached(request.unit)) {
-      future = cache.computeImportInfo(request.unit, request.searchEngine);
+      future = cache.computeImportInfo(
+          request.unit,
+          request.searchEngine,
+          shouldWaitForLowPrioritySuggestions);
     }
-    if (future != null && shouldWaitForLowPrioritySuggestions) {
+    if (future != null) {
       return future.then(addSuggestions);
     }
     return addSuggestions(true);
   }
 
   /**
    * Add imported element suggestions.
    */
   void _addElementSuggestions(List<Element> elements) {
     elements.forEach((Element elem) {
@@ skipping 82 matching lines @@
     addFilteredSuggestions(cache.importedTypeSuggestions);
     addFilteredSuggestions(cache.libraryPrefixSuggestions);
     if (!typesOnly) {
       addFilteredSuggestions(cache.otherImportedSuggestions);
       if (!excludeVoidReturn) {
         addFilteredSuggestions(cache.importedVoidReturnSuggestions);
       }
     }
   }
 }