Fix for updating documentationComment for top-level variables.

pkg/analyzer/test/generated/incremental_resolver_test.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 analyzer.test.generated.incremental_resolver_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/context/cache.dart';
@@ skipping 560 matching lines @@
 class A {
   /**
    * A field [field] of the type [int] in the class [A].
    * Updated, with a reference to the [String] type.
    */
   int field;
 }
 ''');
   }
 
+  void test_dartDoc_beforeTopLevelVariable() {
+    _resolveUnit(r'''
+/**
+ * Variables [V1] and [V2] of type [int].
+ */
+int V1, V2;
+''');
+    _updateAndValidate(r'''
+/**
+ * Variables [V1] and [V2] of type [int].
+ * Updated, with a reference to the [String] type.
+ */
+int V1, V2;
+''');
+  }
+
   void test_dartDoc_clumsy_addReference() {
     _resolveUnit(r'''
 /**
  * aaa bbbb
  */
 main() {
 }
 ''');
     _updateAndValidate(r'''
 /**
@@ skipping 1743 matching lines @@
   void logException(Object exception, [Object stackTrace]) {
     lastException = exception;
     lastStackTrace = stackTrace;
   }
 
   @override
   logging.LoggingTimer startTimer() {
     return new logging.LoggingTimer(this);
   }
 }