Fix for 'implemented' notification after an incremental change.

pkg/analyzer/lib/src/generated/incremental_resolver.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 engine.incremental_resolver;
 
 import 'dart:collection';
 import 'dart:math' as math;
 
 import 'package:analyzer/src/context/cache.dart'
@@ skipping 1026 matching lines @@
       }
       // resolve
       _resolveReferences(rootNode);
       _computeConstants(rootNode);
       _resolveErrors = errorListener.getErrorsForSource(_source);
       // verify
       _verify(rootNode);
       _context.invalidateLibraryHints(_librarySource);
       // update entry errors
       _updateEntry();
-      // notify unit
-      _definingUnit.afterIncrementalResolution();
       // OK
       return true;
     } finally {
       logger.exit();
     }
   }
 
   void _buildElements(AstNode node) {
     LoggingTimer timer = logger.startTimer();
     try {
@@ skipping 213 matching lines @@
         timer.stop('invalidate cache with delta');
       }
     }
   }
 
   void _updateElementNameOffsets() {
     LoggingTimer timer = logger.startTimer();
     try {
       _definingUnit
           .accept(new _ElementNameOffsetUpdater(_updateOffset, _updateDelta));
+      _definingUnit.afterIncrementalResolution();
     } finally {
       timer.stop('update element offsets');
     }
   }
 
   void _updateEntry() {
     if (oldEntry != null) {
       _updateEntry_OLD();
     } else {
       _updateEntry_NEW();
@@ skipping 834 matching lines @@
   @override
   String toString() => name;
 }
 
 class _TokenPair {
   final _TokenDifferenceKind kind;
   final Token oldToken;
   final Token newToken;
   _TokenPair(this.kind, this.oldToken, this.newToken);
 }