Use AnalysisDriver.getCachedResult() for 'implemented' notification.

pkg/analysis_server/lib/src/operation/operation_analysis.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.
 
 import 'dart:async';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/computer/computer_highlights.dart';
 import 'package:analysis_server/src/computer/computer_highlights2.dart';
 import 'package:analysis_server/src/computer/computer_outline.dart';
@@ skipping 23 matching lines @@
   }
 }
 
 Future<Null> scheduleImplementedNotification(
     AnalysisServer server, Iterable<String> files) async {
   SearchEngine searchEngine = server.searchEngine;
   if (searchEngine == null) {
     return;
   }
   for (String file in files) {
-    CompilationUnit unit = await server.getResolvedCompilationUnit(file);
+    CompilationUnit unit = server.getCachedAnalysisResult(file)?.unit;
     CompilationUnitElement unitElement = unit?.element;
     if (unitElement != null) {
       try {
         ImplementedComputer computer =
             new ImplementedComputer(searchEngine, unitElement);
         await computer.compute();
         var params = new protocol.AnalysisImplementedParams(
             file, computer.classes, computer.members);
         server.sendNotification(params.toNotification());
       } catch (exception, stackTrace) {
@@ skipping 102 matching lines @@
 void _sendNotification(AnalysisServer server, f()) {
   ServerPerformanceStatistics.notices.makeCurrentWhile(() {
     try {
       f();
     } catch (exception, stackTrace) {
       server.sendServerErrorNotification(
           'Failed to send notification', exception, stackTrace);
     }
   });
 }