Enable 'analysis.implemented' with the new analysis driver.

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';
 import 'package:analysis_server/src/computer/computer_overrides.dart';
 import 'package:analysis_server/src/domains/analysis/implemented_dart.dart';
 import 'package:analysis_server/src/domains/analysis/navigation.dart';
 import 'package:analysis_server/src/domains/analysis/occurrences.dart';
 import 'package:analysis_server/src/operation/operation.dart';
 import 'package:analysis_server/src/protocol_server.dart' as protocol;
@@ skipping 16 matching lines @@
     try {
       return f();
     } finally {
       context.isActive = false;
     }
   } else {
     return f();
   }
 }
 
-scheduleImplementedNotification(
+Future<Null> scheduleImplementedNotification(
     AnalysisServer server, Iterable<String> files) async {
   SearchEngine searchEngine = server.searchEngine;
   if (searchEngine == null) {
     return;
   }
   for (String file in files) {
-    CompilationUnitElement unitElement = server.getCompilationUnitElement(file);
+    CompilationUnit unit = await server.getResolvedCompilationUnit(file);
+    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) {
         server.sendServerErrorNotification(
@@ skipping 482 matching lines @@
 abstract class _SingleFileOperation extends SourceSensitiveOperation {
   final String file;
 
   _SingleFileOperation(AnalysisContext context, this.file) : super(context);
 
   @override
   bool shouldBeDiscardedOnSourceChange(Source source) {
     return source.fullName == file;
   }
 }