Add summary support for ConstructorElement.nameEnd and .periodOffset.

pkg/analyzer/test/src/summary/resynthesize_test.dart

 // Copyright (c) 2015, 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 test.src.serialization.elements_test;
 
 import 'dart:convert';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 474 matching lines @@
       compareConstAstLists(resynthesizedImpl.constantInitializers,
           originalImpl.constantInitializers, desc);
     }
     if (original.redirectedConstructor == null) {
       expect(resynthesized.redirectedConstructor, isNull, reason: desc);
     } else {
       compareConstructorElements(resynthesized.redirectedConstructor,
           original.redirectedConstructor, '$desc redirectedConstructor');
     }
     checkPossibleMember(resynthesized, original, desc);
+    expect(resynthesized.nameEnd, original.nameEnd, reason: desc);
+    expect(resynthesized.periodOffset, original.periodOffset, reason: desc);
   }
 
   void compareConstValues(
       DartObject resynthesized, DartObject original, String desc) {
     if (original == null) {
       expect(resynthesized, isNull, reason: desc);
     } else {
       expect(resynthesized, isNotNull, reason: desc);
       compareTypes(resynthesized.type, original.type, desc);
       expect(resynthesized.hasKnownValue, original.hasKnownValue, reason: desc);
@@ skipping 3446 matching lines @@
       fail('Unexpectedly tried to get unlinked summary for $uri');
     }
     return serializedUnit;
   }
 
   @override
   bool hasLibrarySummary(String uri) {
     return true;
   }
 }